PDF Wiring Diagram Manual 1966 GMC Truck - 829 KB

This manual contains the complete wiring diagrams for 1966 GMC trucks.

It is an indispensable resource for anyone restoring or repairing the electrical system of these classic vehicles.

The clear, detailed schematics make it easy to trace circuits, diagnose electrical problems, and correctly install new components.

This guide is a must-have for vintage GMC truck enthusiasts and mechanics.

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--- Page 1 ---
X -6 7 0 5


                                                     r


J      GMC TRUCK
    WIRING DIAGRi


               ALL MODELS
       BUILT AFTER AUGUST 22, 1966

           GMC TRUCK & COACH DIVISION
           GENERAL MOTORS CORPORATION
                 Pontiac, Michigan

--- Page 3 ---
SYM        COLO R                                                                             R E A R E L E C T . E Q U IP P A N E L

               BN. = BROW N
                 T = TAN
                 Y = YELLOW
               GR = GREEN
                 R = RED
               BK = B L A C K
               BL = B LU E
                 M = M AROON                                                                                                                                      ZT-39Z
                 N = NATURAL
               C T = CROSSTRACER
               TR = TRA CER
                / / = RARALLEL
         ------------------ D O T T E D L IN E S D E N O T E
                        R P O W IR IN G        OR PARTS
         -------------- =■ S T A N D A R D W IR IN G


              AUX.

                        NOTE: ALL          CONNECTORS          S H O W N L O O K IN G
                        IN T O O P E N M A T IN G E N D S .


                            A X L E S H IF T
                               M T R . SW .


T-3726
                                                                                        M D — 1209— Engine and Chassis Wiring— RM 7 5 0 0 P/R with 130-Am p. G en erator

--- Page 4 ---
TM/WM 8500A ; TE/WE/TJ/WJ/TW/WW 9500A

--- Page 5 ---
M D — 961 4 4A — Cab, Engine, and Chassis Wiring— D L A /D L V 4 0 0 0 ; TG 7 5 0 0 A / V

--- Page 6 ---
M D — 9 7 0 8 7 C — Cab, Engine, and Chassis Wiring— LI 3 5 0 0 ; L V l 4 0 0 0


L

--- Page 7 ---
M D — 99156E— Cab Wiring— H G /H M 5 5 0 0 A / V ; H G / H M / J G / J M 7 5 0 0 A / V

--- Page 8 ---
M D — 9 9 3 2 6 B — Engine Wiring— H V / J V 7 5 0 0 A

--- Page 9 ---
SYM    CO LO R
                   B N = BROWN
                     T • TAN
                      Y - YELLO W
                    GR = G R E E N
*
                     R - RED
                    BK * B L A C K
                    BL = BLUE
                     M = MAROON
                      N * NATURAL                                                                                 I4 -N -R -C T -3 9 Z
*                  C T = CR O SSTR A C ER                                                                         IG.CONT.
                    TR - TR A C E R
                     / / » PA RA LLEL
               --------- * S T D . WIRING
               --------- -- R .R 0 . W IRING ft P A R T S


                          C IR . BR KR


         A L L C O N N E C T O R S SH O W N L O O K IN G
         A T O P E N M A TIN G       ENDS


                           A X LE SH IF T
                              M TR.SW.


* -


      T-3786
                                                            M D — 9 9 3 3 9 B — Engine and Chassis Wiring— R G 7 5 0 0 P /R

--- Page 10 ---
MD— 99654B— Cab Wiring— MH/Ml 9501A

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