I'm adding back up rigids lights to my truck. Can the factory wire trailer harness handle an additional 5 amps? I have a pair of D2's.
I want the led lights to come on when I put the truck in reverse. I had planned on tapping into the reverse wire on the factory trailer harness.

 

I thought the reverse light was separate from the trailer harness. Or are you talking about the 7 pin?

 

I plan on tying the rigids into the 7 pin reverse wire on the harness

 

YES
The 7pin is on its own fuse. You can use the center reverse wire for your signal and power for the D2's. You may overload that circuit if you hook up a trailer but I'm not certain on that one.

Have you thought about using Rigid's wiring harness? It's a great little piece and would provide dedicated power. It comes with a 3-way switch (Off, Auto, On). I used it with the SR-M kit that I'm using for reverse lights...I really like it. It's fully loomed and ready to install. Hardest part is getting the switch in a spot you like and getting the relay into the cab.

 

The way the backup lights are going to be installed is obviously when I put the truck in reverse the backup lights will come on automatically. I am also going to have a separate switch inside of the cab where I can turn the lights on and off whenever I want to. So just for clarification the seven pin harness will be able to handle 5 Amps from the lights?
The only trailer plug that I currently use and probably will ever use is the 4 point trailer plug.

Also, is the 4 point trailer plug and 7 pin on separate fuses?
Will I need a relay regardless?

 

YES the 7pin can support the D2 draw.

YES you'll need a relay if you plan on using a switch. Look into the Rigid wiring harness. It's worth the money.

 

I would use a relay for anything aftermarket. Fuses are sized accordingly to the factory draw on the circuits. It's up to you though. Just make sure you always fuse your connections and find a good grounding point.

 

Thx guys! The lights are going in Saturday

 

A relay is not necessarily required just because a switch is wanted. The switch can be on the ground side of the circuit; open switch means no connection to ground and the lights can't turn on.

 

I would use a relay, you can get your power and ground off the 7 pin, as well as the backup light feed. I mounted my relay behind the drivers side tail light. you can use a separate switch with a diode so you don't backfeed your circuit.