Student Guide TBB 2003 Thomas Body PCB Electrical

Student Guide TBB 2003 Thomas Body PCB Electrical Saf-T-Liner HDX Saf-T-Liner EF Minotour Conventional/FS 65

Thomas Body Electrical TBB 2003 Course Objectives • understanding of printed circuit boards • read and understand Thomas schematics • identify body harness routing • understand chassis-body interface • follow troubleshooting procedure • access service publications and info

Thomas Body PCB Electrical TBB 2003 Course Content: 1. Printed Circuit Boards 2. Battery, Ignition, Ground 3. Wiring 4. Understanding Thomas Drawings 5. School Bus Options 6. Service Publications 7. Evaluation 8. Reference

Thomas Body PCB Electrical Section 1 Printed Circuit Boards

Thomas Body PCB Electrical Minotour Saf-T-Liner HDX Conventional Saf-T-Liner EF Page 1 -2

Thomas Body PCB Electrical Printed Circuit Boards This electrical system was designed by market, AMPs, and option demand. Make a list of consumers found in every bus ____________________________ ______________ it makes sense to control these consumers by the same device and in the same area on every bus Make a list of consumers by market School ________ Transit _________ Chick __________ These consumers would also be controlled by a common device mount in the same area Page 1 -3

Thomas Body PCB Electrical Printed Circuit Boards Initial Production Configuration • Began in production with 2000 model Type D “New Look” pushers Page 1 -4

Thomas Body PCB Electrical Printed Circuit Boards Conventional/FS 65, Saf-T-Liner HDX • Conventional/FS 65 new external access April, 2003 • New Look Pusher started 2000 ER-Transit MVP-ER HD HDX Page 1 -5

Thomas Body PCB Electrical Printed Circuit Boards MVP-EF Started 2004 Minotour Started 2005 Page 1 -6

Thomas Body PCB Electrical Printed Circuit Boards How many amps is required to provide power to a typical bus body? _____ The rear box pictured above from ER-Transit model Page 1 -7

Thomas Body PCB Electrical Printed Circuit Boards • non-conductive platform with printed circuit paths • non-repairable component Front side of B 2 is pictured Page 1 -8

Thomas Body PCB Electrical TBB 2003 Printed Circuit Boards AMP Load Capacity List examples of circuits for each load: 1 amp ____________ 5 amp ____________ 15 amp ____________ 30 amp ____________ reference Drawing# 52004770 Page 1 -9

Thomas Body PCB Electrical Printed Circuit Boards 4 buss bars for parallel circuits Page 1 -10

Thomas Body PCB Electrical Printed Circuit Boards How many large cables connect to B 1_____ B 2_____ 4 internal buss bars but 2 cables? Page 1 -11

Thomas Body Electrical TBB 2003 Printed Circuit Boards What is role of diodes D 5_____ D 6_____ D 7_____ Page 1 -12

Thomas Body Electrical TBB 2003 Printed Circuit Boards LED lights Have 1000 ohm Resistors/diodes Why? Diodes installed Between D 6 Ignition & Ground D 3 between Switched Power & Ground Where is the bias? See Drawing 52004770 & 52005370 Page 1 -13

Thomas Body PCB Electrical Printed Circuit Boards Hands-on Activity#1 LED#29 Relay#3 LED#4 tells me______________ LED#29 tells me_____________ Page 1 -14

Thomas Body PCB Electrical Printed Circuit Boards Hands On Activity#1 using LED lights Complaint: front dome lights are inop Are front dome lights a body or chassis option? ______ Are front dome lights an option found on all buses or just school buses? ______ Which PCB will control this option? ______ Locate the decal on the service compartment door for B#1 What relay controls the front dome lights? ______ Page 1 -15

Thomas Body PCB Electrical Hands-on Activity #2 R&R both PCB Board#1 and #2 What tools are required to remove? ____________________ Remember to first disconnect the batteries Page 1 -16

Thomas Body PCB Electrical Hands-on Activity#3 You will need a DVOM With the ignition key in the on position Remove P 5 -B 1 and locate circuit LT 174 yellow At pin 8 Test the circuit for voltage_____ Disconnect the flasher or flasher fuse at the chassis Test the circuit for voltage_____ Reinstall P 5 -B 1 and flasher fuse and remove P 4 -B 1 Test circuit LT 10 yellow for voltage_____ Reinstall P 4 -B 1 and remove P 29 -B 1 Test circuit LT 174 yellow for voltage_______ Page 1 -17

Thomas Body Electrical TBB 2003 Hands-on Activity #4 You will need a DVOM Disconnect P 5 -B 1 and locate circuit LB 172 red Test the circuit for voltage_____ Step on the service brake and test voltage See LED#31 amber Re-connect P 5 -B 1 and disconnect P 4 -B 1 Test voltage at pins 3 and 8 red/white wire Depress service brake and test voltage ____ Page 1 -18

Thomas Body PCB Electrical Section 2 Battery, Ignition, and Ground

Thomas Body PCB Electrical Hands-on Activity# 5 Battery, Ignition and Ground Trace the battery cable for the body Where is the body breaker for B 1 HDX_____________ EF_____________ Conventional_________ Minotour___________ Page 2 -2

Thomas Body PCB Electrical Battery, Ignition and Ground Minotour GMC Ford Page 2 -3

Thomas Body PCB Electrical Battery, Ground and Ignition HDX Battery cable to body from chassis Page 2 -4

Thomas Body PCB Electrical Battery, Ignition and Ground Saf-T-Liner-EF Cable routes from solid state breaker on left Frame rail under driver’s seat to B 1 Page 2 -5

Thomas Body PCB Electrical Battery, Ignition and Ground 61202164 solid state breaker Used on HDX and EF as breaker for battery to body and chassis HDX- mounted on right frame rail just forward of engine compartment EF-mounted to left frame rail below driver’s seat Page 2 -6

Thomas Body PCB Electrical Battery, Ignition and Ground Body Breaker on Conventional • located in lower switch cabinet Page 2 -7

Thomas Body PCB Electrical Battery, Ground, and Ignition Follow the Ground cable from B 1 Where does it go? HDX____________ EF_____________ CONVENTIONAL_______ MINOTOUR__________ Using drawing#52004770 and 52005370 Why is there no main ground cable on B 2? _______________ Locate drawing#52004993 This is a jumper harness from B 1 to B 2 Follow GND on Pin 1 to ground buss Inside B! and B 2 Page 2 -8

Thomas Body PCB Electrical Battery, Ignition and Ground See note B on drawing 52004778 and 52005555 Maximum tightening torque on power connections 65 in-lbs Page 2 -9

Thomas Body PCB Electrical Battery, Ground and Ignition Shunts Refer to drawing 52004770 Locate J 1 Shunts are non-keyed jumpers Easily changes safety buzzer behavior Page 2 -10

Thomas Body PCB Electrical Battery, Ground, and Ignition Use drawings 52004770, 52005370 and 52004993 Locate relay#5 on B 1 Pin 87 of relay#5 power the ignition buss bar in B 1 Follow the ignition/key switch signal from pin 86 of Relay#5 The chassis delivers the key switch signal at P_____ pin______ What powers the ignition buss bar in B 2? _________________ Locate relay#10 on B 2 What circuit connects at pin 86 of relay#10? ____ Page 2 -11

Thomas Body PCB Electrical Battery, Ignition and Ground Switched Power See Drawings 52004770 & 52005370 The school bus market requests an unusual option; at rail road crossings we want to turn off all noise so the driver can hear an on-coming train Noise suppression requires control of specific consumers when the ignition is on Locate the Noise Suppression relay#9 on B 1 schematic Like other relays power to pin 30 comes from battery Pin 87 output goes to switched power buss bar Locate the relays controlling defroster fans What powers pin 30? _________ From P 28 -B 1 pin 4 delivers switched power to B 2 noise suppression controls the radio Page 2 -12

Thomas Body PCB Electrical Section 3 Wiring

Thomas Body PCB Electrical Wiring • Wire is color coded • Ground wires are white • Wire printed with circuit number Page 3 -2

Thomas Body PCB Electrical Wiring LW-Warning Light LD-Light SA-Safety LB-Brake Light LR-Rear Light LT-Turn Light FD-Fan LS-Strobe Light MH-Mirror DF-Door LM-Marker Light GND-Ground SP-Spare, Speaker IGN-Ignition BATT-Battery LP-Panel Light SW-Switch JP-Jumper POW-Power from fuse RLY-Relay LGT-Output to light IGN-Ignition GA-Gauge PWR-Power ST-Start SW-Switch DIM-Dimmer EL-Headlight AL-Alternator AD-Air Dryer ICU-Dash SG-Shielded Ground EL-Headlight DRL-Daytime Running * Abbreviation printed on wire and used on electrical drawings/schematics Example: circuit# 10 is yellow and found in the body harness With prefix I know LT 10 is the front & rear left turn lights Page 3 -3

Thomas Body PCB Electrical Wiring • Each PCB board has keyed connector locations on the back • Each PCB board will have many of the same number of connector locations • These connector locations are referred to as “J” • the corresponding harness connector for each J location in the back is labeled “P” or plug • these “J” and “P” numbers allow you to locate on the bus specific circuits shown in schematics Page 3 -4

Thomas Body PCB Electrical Wiring • Pre-made harnesses come color coded from the vendor • This color coding assists in production and service Where do I install these connections? _______________ Page 3 -5

Thomas Body PCB Electrical Wiring Switch Cabinets • pre-assembled sub components during production • switch base harnesses route to the controlling PCB Page 3 -6

Thomas Body PCB Electrical Wiring Chassis Interface Connector Saf-T-Liner EF Page 3 -7

Thomas Body PCB Electrical Wiring Chassis Interface Connector Minotour / Ford and GMC J 10 interface connector located on left side rear cross-member Page 3 -8

Thomas Body PCB Electrical Wiring Harness Routing Body harness Front harness Transition path for harnesses from switch cabinet to body harness HDX, EF and Conventional Page 3 -9

Thomas Body PCB Electrical Wiring Harness Routing Minotour Rear side of Overhead Compartment • Interface harness • main body harness from PCBs • switch cabinet harness • battery cable to B 1 Page 3 -10

Thomas Body PCB Electrical Wiring Body harness routing in left curtain rail for all models What circuits would I find in this harness? ______________________ Where would I find connections to this harness? _____________________ What types of electrical failures may I see in the body harness? _________________ Page 3 -11

Thomas Body PCB Electrical Wiring Maintenance Dos: • inspect wires • repair properly • protect Don’ts: • damage when testing • make poor repairs • leave loose Return to manufacture’s standard or improve it Page 3 -12

Thomas Body PCB Electrical Section 4 Understanding Thomas Drawings

Thomas Body PCB Electrical Understanding Thomas Drawing Numbers beginning with 5 body Drawing Numbers beginning with 6 chassis Newest TBB Drawing numbers are 6 digit like 112034 They are sequentially assigned Page 4 -2

Thomas Body PCB Electrical Understanding Thomas Drawings Types Installation- a visual representation of either the component installation like harness routing or the installed component Assembly- a visual representation of every piece used to make the assembly includes dimensions and part numbers assembly drawing numbers are the part number for the assembly Schematic- a visual representation of the flow of electricity through a specific path including all components used primarily for diagnostic purposes Page 4 -3

Thomas Body PCB Electrical Understanding Thomas Drawings Assembly Drawings Using drawing#52005500 How long is the wire from P 34 -B 2 to the intersection at the left curtain rail? ______ What is the connector part number for P 99? ____ In P 4 -B 1 what is the pin location for circuit LM 12? ____ What is circuit SP-2? _____________ Installation Drawings Using drawing#52006276 How many fasteners must be removed to R&R B 2? ___ Where is the Weldon flasher mounted? _______ Are the PCBs mounted per this drawing? ______ Page 4 -4

Thomas Body PCB Electrical Understanding Thomas Drawings Schematics Use Drawing#52007002 to answer the following questions: Do the dome lights work on battery or ignition? _____ How could I change the board to change the first question? ________ What PCB controls the dome lights? _____ What Amber LED lit tells me that Relay#4 has power? _____ Where would I look for S 3 on circuit LD 19 in the bus? _____________________ If diode D 3 went bad inside B 1 what would the driver report? __________________ What failure/s would result in front, rear and driver’s dome lights being inop? ________________ Page 4 -5

Thomas Body PCB Electrical Understanding Thomas Drawings Using drawing#5204770 Please draw a straight-line type schematic for the front passenger heater Page 4 -6

Thomas Body PCB Electrical Understanding Thomas Drawings Use drawing#52006970 to answer the following questions: How many PCBs control the warning light option? ______ Which relay controls the red lights? _________ When the driver opens the door what is the circuit number that tells the Weldon that the door is open? ______ LED#39 tells me power is being delivered to_______ What would happen if the GND circuit in jumper P 28 -B 1 went open? ___________________ Where does the stop arm connect to B 2? ______ What connects at connector#CSA ? _________ What would happen if circuit JP 3 was open? ______ Page 4 -7

Thomas Body PCB Electrical Section 5 School Bus Options

Thomas Body PCB Electrical Weldon 7000 -100 Pin Location & TBB Circuits 5 4 321 12 11 10 9 8 7 6 1 = Left Amber = LW 55 yellow 2 = Left Red = LW 57 red 3 = Stop Arm = LW 82 -2 gray 4 = Right Red = LW 56 red 5 = Right Amber = LW 58 yellow 6 = Battery Power = LW 149 -1 -A orange 7 = Battery Power = LW 149 -1 -B orange 8 = Override Power 9 = Start Switch = LW 80 tan 10 =Seq. Door Switch(GND) = LW 59 pink 11 =Nonseq. Door Switch(GND) = LW 81 purple 12 =Ground = GND white (Use 6 inch jumper with #16 Deutsch pins to troubleshoot) Page 5 -2

Thomas Body PCB Electrical Passenger Advisory-Check Mate See PSB 07 -11 R 4 Page 5 -3

Thomas Body PCB Electrical School Bus Options Doran Light Monitor • follow calibration sequence in PSB 07 -13 Page 5 -4

Thomas Body PCB Electrical Aftermarket Add-ons List consumers you may want to add To the body after delivery _____________________________ How many amps are required? Where is the consumer to be mounted? When will it work? Key off or key on Page 5 -5

Thomas Body PCB Electrical Aftermarket Add-ons Using drawing 52004770 If I connect a consumer in series to the large terminals on B 1 either Battery or Ignition, what effect will it have on B 1? ______________________ Page 5 -6

Thomas Body PCB Electrical Aftermarket Add-ons Using drawing#52005555 Locate J 32 on the drawing This connection supplies the required data to correctly wire two relays(#2 and #8) What is the maximum amp size of the added consumer? _______ What pin #s would be your output wires to your consumer? _____ What pin# goes to your switch? _______ Be Consistent and Keep Records What unit# and How is it wired See Drawing 52006999 Fog Lamps Page 5 -7

Thomas Body Electrical TBB 2003 Section 6 Service Resources -Printed -Electronic Page

Thomas Body PCB Electrical Service Publications Printed Publications can be ordered But more easily accessible on-line Page 6 -2

Thomas Body PCB Electrical Service Resources Mytbb. thomasbusonline. com Home page • Service training calendar • TBB news • support or sales • select tab for desired topic Page 6 -3

Thomas Body PCB Electrical Electronic Service Resources The “Parts” tab will provide • viewing/copying the bill of materials • parts look up • viewing of drawings There are two “parts” tabs Parts = Conventional, HDX, EF and Minotour C 2 Parts = C 2 only Page 6 -4

Thomas Body PCB Electrical Electronic Service Resources Information for the Body and Chassis BOM are group together in Modules The module number are a part of the number listed under module Using the module reference page will expedite locating the correction info Page 6 -5

Thomas Body PCB Electrical Electronic Service Resources Parts Tab Once the module has been selected The parts list for that module will appear at the right The PDF files will be drawings you can open, then view save, print or email Page 6 -6

Thomas Body PCB Electrical Electronic Service Resources Parts Tab-Drawings The PDF drawing file is linked to specific Body Number Page 6 -7

Thomas Body PCB Electrical Electronic Service Resources Mytbb. thomasbusonline. com Manuals Tab- Product Support Bulletin 1. Click on desired Document Group 2. Topics are in sequence by release Topics are listed , not linked, on Home Page at TBB News Page 6 -8

Thomas Body PCB Electrical Electronic Service Resources Mytbb. thomasbusonline. com Manuals Tab 1. Click on desired manual type at left Page 6 -9

Thomas Body PCB Electrical Electronic Service Resources Manuals Tab-Electrical Manuals These electrical manuals are PDF files of printed manuals by year by model You will note that the newer the model the more pages in the manual Page 6 -10

Thomas Body PCB Electrical Electronic Service Resources Manuals Tab-Product Support Bulletins • not available in any other way • organized by product (C 2 separate) • organized by Body and Chassis then Category Page 6 -11

Thomas Body PCB Electrical Electronic Service Resources Manuals Tab-Product Support Bulletins PSBs are in PDF files that you can view, print or email Page 6 -12

Thomas Body PCB Electrical Electronic Service Resources Manuals Tab-Electrical Manuals PDF or Zip files organized by Body or Chassis then by functional group like “Lights” * Best to know your order option number Page 6 -13

Thomas Body PCB Electrical Electronic Service Resources Manuals Tab-Reference Within the Reference group you will find complete instructions on using this web site Page 6 -14

Thomas Body PCB Electrical Evaluation 7

Training Evaluation Class: _____________ Date: ______ Instructor: ___________ Please circle the number on each scale which most closely reflects your opinion 1. Student manuals and handouts were? Excellent Good 1 2 3 4 5 6 7 8 9 Poor 10 2. Overheads, presentations, and video tapes were? Excellent Good Poor 1 2 3 4 5 6 7 8 9 10 3. Shop demonstrations were? Excellent Good 1 2 3 4 5 6 7 Poor 10 8 9 8 Too Short 9 10 5. The pace of the presentation was? Too Fast Just Right 1 2 3 4 5 6 7 8 Too Slow 9 10 6. The amount of shop time was? Too Much Just Right 1 2 3 4 5 6 7 Not Enough 9 10 4. The length of the course was? Too Long Just Right 1 2 3 4 5 6 7 8

Training Evaluation page 2 Please circle the number on each scale which most closely reflects your opinion 7. Did the class provide the expected instruction? Yes Somewhat No 1 2 3 4 5 6 7 8 9 10 Comments: ____________________________________ 8. Would you recommend this class to others? Definitely To Some No 1 2 3 4 5 6 7 8 9 10 9. Do you feel that what you’ve learned will help you do your job better? Help A Lot Help Some No Help 1 2 3 4 5 6 7 8 9 10 10. What was your overall impression of the course? Excellent Good Poor 1 2 3 4 5 6 7 8 9 10 11. If you were to make changes, what would they be? ___________________________________________ Thanks for attending our class

Thomas Body PCB Electrical Reference 8 -Modules -Identifying your bus -Circuit numbers

Thomas Body PCB Electrical Reference Page 8 -2

Thomas Body PCB Electrical Reference Page 8 -3

Thomas Body PCB Electrical Reference Locating Body Identification Numbers • Data plates are normally found above the driver’s window or on the front bulkhead Page 8 -4

Thomas Body PCB Electrical Reference HIGH POINT, NORTH CAROLINA WOODSTOCK, ONTARIO MONTERREY, M. L. , MEXICO MFD. BY THOMAS BUILT BUSES, INC. MADE IN U. S. A. DATE: NC VEH MFD BY: Body Identification Number DATE: GVWR: GAWR FRONT: WITH TIRES RIMS PSI COLD GAWR INTERMEDIATE: WITH TIRES RIMS PSI COLD GAWR REAR: WITH TIRES RIMS PSI COLD THIS VEHICLE CONFORMS TO ALL APPLICABLE FEDERAL MOTOR VEHICLE SAFETY STANDARDS IN EFFECT IN: LIMITS: V. I. N. : CHAS. ID. NO: 27230 VEH. TYPE: EQUIP. CAP. : BODY ID. : 82508 - 9952194 - 1308 S (order #) - (body #) - (model #) MAX CAP SUB TO DESIGN Page 8 -5

Thomas Body PCB Electrical Reference Body Identification Number Three Groups of Numbers 82508 - 9952194 - 1308 S Order# (first group) -Assigned consecutively to an order when it is received in High Point -Each Pusher has its own order# Body# (second group) -Assigned consecutively to each body -First two digits are year built Body Model ID (third group) -First three digits are body length -Fourth digit is type of bus -Fifth digit indicates school or non-school Page 8 -6

Thomas Body PCB Electrical Reference HIGH POINT, NORTH CAROLINA WOODSTOCK, ONTARIO MONTERREY, M. L. , MEXICO MFD. BY THOMAS BUILT BUSES, INC. MADE IN U. S. A. DATE: CHASSIS YARD NO. MODEL YEAR ENGINE: SER NO TRANS: SER NO FRONT AXLE MOD NO Body Identification Number INT AXLE MOD NO REAR AXLE MOD NO BODY ID. : Chassis Data Plate • Body Id# found here as well as standard data plate Page 8 -7

Thomas Body PCB Electrical Reference Locating Body Identification Numbers By Model Minotour, SRW & DRW Order# & Body# Page 8 -8

Thomas Body PCB Electrical Reference Locating Body Identification Numbers By Model Conventional Order# & Body# Page 8 -9

Thomas Body PCB Electrical Reference Locating Body Identification Numbers By Model Saf-T-Liner ER and HD (butyl tape applied trim) Order# & Model# Page 8 -10

Thomas Body PCB Electrical Reference Locating Body Identification Numbers By Model Saf-T-Liner ER , HD and HDX (fastener applied trim on D/door post) Order # & Body# on welded plate mounted on firewall below treadle valve Page 8 -11

Thomas Body PCB Electrical Reference Locating ID Numbers Chassis number stamped Page 8 -12

Thomas Body PCB Electrical Reference Identifying the Bus 1 T 7 YR 4 B 2 8 411 32540 MERCEDES CUMMINS Use this vin # to answer these questions What model is _______________? What type of engine does it have ________? What is the headroom____________? What was the year of manufacture_______? Does this bus have air or hydraulic brakes____? Page 8 -13

Thomas Body Electrical Reference Body Circuit Numbers Circuit# Description Color 176 Doran Monitor Feed Red 177 Doran Monitor Ground White AV 599 LED Pilot Light Pink Battery Power Green BRK_INTERLOCK Signal to Chassis disrupts brake Orange CHILD_ALARM Signal to Chassis for Child Alarm Horn Purple/White CROSS_ARM Signal to Chassis for Crossing Arm Purple/White DF 426 Door Switch Open Green DF 427 Door Switch Override Yellow DF 428 Door Signal Red DOOR_RTN Signal to Chassis for Door DK Blue DS 27 Destination Sign Pink F_L Front Passenger Heater Low Purple F_P_H Front Passenger Heater High Yellow F 317 Hatch Fan Orange FD 34 Left Defroster Fan Gray FD 35 Right Defroster Fan Tan FD 36 Left Defroster Fan Black FD 37 Right Defroster Fan Blue GND Ground White Horn Output Blue Page 8 -14

Thomas Body Electrical Reference Body Circuit Numbers Circuit# Description Color HTR_CBLE_F Front Heater Red HTR_CBLE_R Rear Heater Red IGN Ignition Power Red IGN_F_P Ignition Front Passenger Heater Blue IGN_R_P Ignition Right Passenger Heater Blue KNEEL_CKT Signal to Chassis for kneel Black LB 13 Brake Light Blue LB 15 Right Brake Light Red LB 16 Left Brake Light Red/White LB 172 Brake Light Indicator Red LD 19 Rear Dome Lights Black LD 20 Front Dome Lights White/Black LD 20 Driver's Dome Light Black LE 74 Front Entrance Light Blue LM 12 Marker Light Brown/White LM 168 Marker Light Brown LM 40 Side Marker Lights Brown Low_SPD_SIG Signal from Chassis for low speed Tan LP 70 Panel Lamp Orange LP 70 -A Dimmer Black LR 14 Reverse Light Blue/White LR 170 Reverse Light Blue LR 170 A Reverse Light Feed Brown LS 38 Strobe Light Purple Page 8 -15

Thomas Body Electrical Reference Body Circuit Numbers LT 10 Front & Rear Left Turn Lamp Yellow LT 174 Left Turn Lamp Yellow LT 175 Right Turn Lamp Green LT 9 Front & Rear Right Turn Lamp D Green LW 1 Left Rear Red Warning Light Black LW 149 Warning Light Flasher Power Orange LW 2 Right Front Red Warning Light Brown LW 3 Right Rear Red Warning Light Orange LW 4 Left Front Red Warning Light Yellow LW 5 Left Rear Amber Warning Light Blue LW 55 Amber Warning Light Yellow LW 56 Red Warning Light Red LW 57 Red Warning Light Red LW 58 Amber Warning Light Yellow LW 59 Door Switch Signal (ground) Pink LW 6 Right Front Amber Warning Light White LW 7 Right Rear Amber Warning Light Red LW 8 Left Front Amber Warning Light Green LW 80 Start Switch 12 V+ Tan LW 81 Door Open Purple LW 82 Stop Arm Signal Gray MH 468 Left Heated Mirror Orange MH 469 Right Heated Mirror Blue Page 8 -16

Thomas Body PCB Electrical Reference Body Circuit Numbers Circuit# Description Color Neutral Signal from Chassis for neutral Black Pump Coolant Pump Brown R_L Rear Passenger Heater Low Pink R_P_H Rear Passenger Heater High Yellow SA 29 Buzzer (GND) Blue SA 32 Vandalock Ground Signal to Chassis Yellow SA 32 -A Vandalock Ground Signal from Rear Gray SA 32 -B Vandalock Yellow SA 33 Buzzer Power Pink SD 59 Door SW Open to Flasher Pink SP 1 Spare Wire for Front Door Purple SP 2 Spare Wire to Rear Green SP 3 Spare Wire for Child Alarm Black SP 4 Spare Wire for Dome Light Yellow SW+ Rear Door Switch Purple SW 1+ Switched Ign Power to Switch Gray SW 2+ Switched Ign Power to Switch Gray Page R-4