GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Instrument Cluster Schematics
Figure 1:

Power and Indicators
Object Number: 1464493 Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Ground and Gages
CHMSL, PWR POST, and RADIO/CHIME FuseS/Circuit Breakers
AUX RLY and IGN 4 - I/P Fuse Block Fuses/Circuit Breakers
Ignition Switch - OFF/RUN/START, RUN/START and START Bus Bars
START and TRANS Fuses/Circuit Breakers
CHMSL, PWR POST, and RADIO/CHIME FuseS/Circuit Breakers
AUX RLY and IGN 4 - I/P Fuse Block Fuses/Circuit Breakers
GAUGES, L-RR TRUCK, R-RR TRUCK, and SIR Fuses/Circuit Breakers
Park Lamps and Roof Marker Lamps
Headlamps, Daytime Running Lamps (DRL)
Park Lamps and Roof Marker Lamps
Interior Dimming Lamps System
Headlamps, Daytime Running Lamps (DRL)
Air Brake System Schematics
Backup Lamps
Park Brakes
Module Power, Ground, Serial Data, and MIL
Module Power,Ground,Serial Data,and MIL
Module Power, Ground, Serial Data, and MIL
Module Power, Ground, Serial Data, and MIL
odule Power, Grounds, Serial Data, and MIL
Module Power, Ground, Serial Data, and MIL
Figure 2:

Ground and Gages
Object Number: 1464496 Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Fuel Gage
Power and Indicators
Splice Pack SP203 (L18/LB7/LG4/LLY)
Power Take Off
G103 - 1 of 2, G105, and G106
G100 (L18)
Figure 3:

Fuel Gage
Object Number: 1464500 Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Ground and Gages
Splice Pack SP203 (L18/LB7/LG4/LLY)
Engine Data Sensors - Glow Plug Controls