Chevrolet Light Duty Truck 1973 Service Manual page 43

Refer to the "Standard Heater" section of this manual
for diagnostic information; see Electrical Diagram
Figure 21.
NOTE: If the heater blower motor is
MED
3
M
RESISTOR
— | 5 l | 5 2 k — 140RG--------[
1 52k
1791 I-----------u n p n ---------------------
72
■14 YEL-
IGN
UNFUSED ________
D
0
12 BRN— - | 15AMP
INLINE FUSE
FUSE
PANa
D IA G N O S IS
BLOWER
52 52
] [ I - I 4 BLK —
I40RG-
-14 LT BLU-
J-12 BRN'
> — 14 LT BLU'
50
■12BRN-
Fig. 21— Electrical Diagram - All Models
HEATER A N D AIR C O N D IT IO N IN G
inoperative on C-K models (equipped with
Overhead Air Conditioning), check that the
connectors have not been interchanged with
one another.
■14 BLK— [5 2 ] [5 2 ]— 14 BLK--------
140RG
14 YEL-
F
52
50
BLOWER SWITCH
1A-17
BLOWER
MOTOR
L 14 BLK
LIGHT DUTY TRUCK SERVICE MANUAL