Did you know?A 'Vortec' 5.3L V8 produces 290 hp (216 kW), for the half-ton 1500 series.
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So I understand this, you want to be able to switch them on manually from the cab or have them come on automatically with the reverse lights? I'll see what I can come up with. Right now I'm thinking just a regular switch in the cab and a relay tied into the reverse lights with a diode to prevent backfeed into the reverse lights when you use the manual switch. It should be possible to put the relay under the dash also so you only have to run one power line to the lights in the rear. Just need to pick up the reverse light trigger up front.
You should be able to get your 12v under the dash in your trailer brake harness. Do you have a trailer brake? If not, I believe the pig tail that came with our 06 is just a plug and play feature under the dash. That is where I had our headrest monitors hooked up to so I know the 12v is there.