Alright so I’m wiring some step lights that will cast down when the doors are open on my truck and I meet to tap the wire that runs power to the one interior light hat I know will work. It runs to a relay, fused and all that nice whatnot. I am not gonna go slicing wires until I know which one it is. So I have narrowed it down on a 2000 4.2 base model SCAB. The wire runs down the passenger side door sill and up the rear passenger side corner of the cab and to the top. However so does the 3rd brake light. So my question is which wire is it?

we have 2 solid blacks, a black/blue, solid green, and a green/orange. I have eliminated the rear speaker wires since they too run with this bundle.

 

You don't need to slice them to check. Just poke a needle in them.

 

Here is the wiring for int. lights

 

Okay it looks like black and light blue, I’ll let y’all know by tomorrow morning weather or not I have it. Too late to test ATM