GMC Sierra Junction Block Relay Diagram The following schematic shows the 2004 GMC Sierra Junction Block and Relay Diagram.

1. Junction block
2. Cover
3. Relay Rear defogger
4. Relay Anti theft
5. Relay Ignition
6. Relay Headlamp
7. Relay Fog lamp
8. Relay Ac compressor
9. Relay Horn
10. Relay Fuel pump
11. Relay Daytime running lamp
12. Maxi 30 amp
13. Mini 10 amp

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