6J3 wiring for old police lighting system?

[5strmtrp]

There’s a bundle of 4 wires that have tan, gray, green & blue wires coming out of the truck towards the headlights. The gray wire connects into forward lamp harness. Does anyone know where that goes to?

I have the wiring schematics up on my computer but it’s not showing where the hell it goes to or does.

Would like to use what’s already wired in the truck with relays etc to run new lighting up front. Lightbar, driving lights, and the LED fogs I have.

 

[Doubeleive]

There’s a bundle of 4 wires that have tan, gray, green & blue wires coming out of the truck towards the headlights. The gray wire connects into forward lamp harness. Does anyone know where that goes to?

I have the wiring schematics up on my computer but it’s not showing where the hell it goes to or does.

Would like to use what’s already wired in the truck with relays etc to run new lighting up front. Lightbar, driving lights, and the LED fogs I have.

you could try checking the gm upfitter guide they usually have good diagrams

 

[5strmtrp]

The upfitter diagram doesn’t go that far. But I’ll keep looking there.