GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Chevy C Cab/Chassis HD (GMT 400) 🢒 Engine 🢒 Engine Electrical 🢒 Engine Electrical Component Views
Figure 1:

C122, PNP Switch, VSS and TISS Sensors - Automatic Transmission
Object Number: 675762 Size: MF
(1)Breakout to Heated Oxygen Sensor - Bank 2 (L18)
(2)Vehicle Speed Sensor (VSS)
(3)Connector C122
(4)Park/Neutral Position Switch (PNP) C2
(5)Park/Neutral Position Switch (PNP) C1
(6)Park/Neutral Position Switch (PNP)
(7)Automatic Transmission Input Shaft Speed (ISS) Sensor
(8)Heated Oxygen Sensor - Bank 1 (L18)
(9)Engine Wiring Harness
Figure 2:

Underhood Fuse Block
Object Number: 681559 Size: MF
(a)Auxiliary Power Stud A
(b)Auxiliary Power Stud B
(1)Battery Stud
(2)AUX B Fuse 30A
(3)LIGHTING Fuse 50A
(4)AUX A Fuse 30A
(5)BATT Fuse 50A
(6)Spare 30A Fuse
(7)Fuse Puller
(8)Spare 20A Fuse
(9)Spare 10A Fuse
(10)IGN A Fuse 40A
(11)ECM- B Fuse 20A
(12)HORN Fuse 20A
(13)A/C Fuse 10A
(14)IGN B Fuse 50A
(15)PTO Fuse 15A
(16)ABS Fuse 60A
(17)IGN-E Fuse 10A
(18)ECM-I Fuse 10A
(19)ENG-I Fuse 20A
(20)BLOWER Fuse 50A
(21)STOP-HAZ Fuse 30A
(22)DIODE
(23)Horn Relay
(24)Fuel Pump Relay
(25)A/C Compressor Relay
(26)Starter Relay
(27)Brake Lamp Relay
Figure 3:

Starter and Knock Sensor - Bank 2
Object Number: 712941 Size: MF
(1)Starter Solenoid Terminal
(2)Battery Positive Wire for Starter
(3)Knock Sensor - Bank 2
(4)Engine Harness
Figure 4:

G110 and Starter
Object Number: 709620 Size: MF
(1)Engine Harness
(2)Glow Plug Wiring
(3)Exhaust Manifold
(4)Starter Solenoid Stud
(5)Starter Wire
(6)Battery Positive Cable
(7)Starter
(8)Frame
(9)Ground Strap from Engine
(10)G110
(11)Ground from Body
(12)Heat Shield
Figure 5:

G102 and Generator Wiring - L18
Object Number: 712947 Size: MF
(1)Generator
(2)Battery Negative Cable to Ground G102
(3)Generator Connector
Figure 6:

C115, Generator, and Engine Coolant Temperature Sensor - L65
Object Number: 709618 Size: MF
(1)C115
(2)Engine Coolant Temperature (ECT) Sensor
(3)Generator
(4)Generator Connector
(5)Generator Jumper Harness
Figure 7:

Dual Generator Support Wiring
Object Number: 391542 Size: MF
(1)Generator - Right
(2)Generator Cable
(3)C115
(4)Electronic Brake Control Module (EBCM)
(5)Battery-Left Side
(6)Generator - Left
(7)Generator Connector - Left
Figure 8:

G102, G103, and Dual Battery Wiring - L65 Single Generator
Object Number: 712948 Size: MF
(1)Battery - Left
(2)Battery Positive-to-Positive Cable
(3)Generator
(4)Battery - Right
(5)Battery Negative Cable to Ground G112
(6)Positive Battery Cable to Starter
(7)Ground G102
(8)Ground G103
(9)Positive Cable to Underhood Fuse Block
Figure 9:

Battery Wiring to Underhood Fuse Block - L65 Dual Generator
Object Number: 712949 Size: MF
(1)Battery Positive Cable
(2)Generator Output Cables
(3)Fused Jumper to Fuse Block - Underhood
(4)Junction Block Cover
(5)Glow Plug Wire
(6)Fused Jumper Wire from Junction Block
(7)Nut
(8)Battery Stud on Fuse Block
(9)Engine Wiring Harness
(10)Battery Positive Cable to Junction Block
(11)Junction Block - Underhood
Figure 10:

G113 and Auxiliary Battery Connections
Object Number: 712946 Size: MF
(1)Fuse Block - Underhood
(2)Forward Lamps Harness
(3)Auxiliary Battery
(4)Auxiliary Battery Negative Wire
(5)Forward Lamps Harness Ground Wire-Left Side
(6)Radiator Support
(7)Ground G113
(8)ABS Module Mounting Bracket
(9)Auxiliary Battery Negative Wire
(10)Auxiliary Battery Positive Wire
Figure 11:

Auxiliary Battery Relay Wiring
Object Number: 712944 Size: MF
(1)C102
(2)Fuse Block - Underhood
(3)Powertrain Control Module (PCM)
(4)Primary Battery Positive Cable to Fuse Block
(5)Auxiliary Battery Positive Cable to Relay
(6)C100
(7)Fused Jumper from Relay to Fuse Block
(8)P100
(9)Auxiliary Battery Relay
(10)Auxiliary Battery Relay Control Wire