So, for whatever reason the previous owner of my truck removed the rear wire harness (along with the box and fuel tanks). In my research on this topic, I've come up with the following for rebuilding a rear harness, but I want to make sure I'm not missing anything.
1 wire for "common" power for rear taillights/plate lights/marker lights (Brown from the factory)
1 wire for brake lights
1 wire for reverse lights
1 wire for left turn signal
1 wire for right turn signal
1 wire for fuel tank sending unit
1 wire for my Carter electronic fuel pump

I will be adding a hitch to this vehicle as well, so a single heavy gauge wire will be run in with these for a 7 pin connector.

Any other suggestions, or anything I missed? Based on what I am seeing with wiring diagrams, all grounding is done to the chassis and a separate wire is not run for that (not that it'd be that hard to add a ground wire in, if that's needed). I don't have another truck to look at, so I'm rebuilding all of this from scratch (also didn't really want to spend the money on a new Centech or Painless harness, although that's probably the easiest way to do this). Also, what size were the original factory wires? I'd assume they were 16-18 or so, and were apparently sufficient. I have 16GA wiring planned out for this, but if I need to jump up to 14 I suppose I could do that.

 

To my knowledge that is pretty much it. I think even the brake lights run through the brown wire, but I could be wrong. (Yes, that is a brown wire for common). Reverse lights are blk/red. Left turn is yellow. Right turn is green. Fuel sending unit is orange. Black connects the circuit and is ground. Each element grounds on its own to the body/frame/chassis (Side-markers, tailights, reverse lights, license plate lights, fuel sending unit) all have separate grounds.

 

No separate brake light wire, the turn signal wires are the brake light wires.

 

Factoy had 5 wires,

• fuel sender wire left the harnes in front of fuel tank. (Not sure of color, think Orange)
• tail & marker & tag-light wire (Brown)
• left signal / brake wire (Yellow/blk)
• right signal / brake wire (Green)
• backup light wire (Blk/red)

 

Thanks all, that's very helpful. Guess I've got some wiring and fuel line to install today

 

Ron Francis or Painless might have a seperate kit.

 

Also depending on the trailer you plan to pull but from the "7 pin (flat?) connector I am thinking you need 2 other wires to the rear.
I run 10 ga wire for each.
Blue for electric trailer brakes
Red for power to charge the brake a way battery on the trailer. This battery could also be to power a winch or on a travel trailer inside lights etc.

Both 10ga have 20 amp breakers, power wire at the battery on truck as it is on the battery for power all the time.
The brake is also at battery as it should have 12 volts all the time too.

Etrailer.com has anything you need and they have wiring diagrams too
Dave ----