Question. Does anyone know where I can hook the power wire to ( constant power) from my light bar?

 

If it were me, I'd wire it directly to the battery(with a proper fuse of course).

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You're going to want to run a switched wire from the fuse box and a constant power from the battery to a relay for sufficient power,

 

Correct, forgot about the relay. And switch of course

I installed cube lights under my bumper. Bought a good wire harness off of Amazon that came with relay, fuse, and switch. Made the install a piece of cake.

 

Sorry for the confusion. I meant one of those tail gate, blinker/running/back up light bars. Same procedure? Didn't think I needed a switch?

 

Those should come with wiring schematics for you.

OR
It will plug it to your towing/trailer harness

 

No schematics and would like it hardwired because trailer plug has no reverse and will interfere with the computer thinking there's a trailer hooked up. I have everything thought out but need a point of constant power, for some reason. The light strip has a harness but one single wire (by itself) that need a constant power

 

You'll need to wire it directly to one of the taillight connectors. Use a multi-meter or test light to figure which wire control each function.

 

I have all that down. Just that single wire to constant power is what I'm stuck on and wondering if anything with constant power goes to the back of the truck.

 

The only thing I can think of is the 12v constant for the trailer. But that may only be energized when a trailer is hooked up. Other than that a long run from either the battery or cab (fused as close to where you get power of course) is in order.