I had an issue with my trailer brake lights. I fixed that issue, but upon fixing it, I had to disconnect the old wiring from the trailer brakes. I had to buy a new adapter that connects from the trailer to truck. My question is, what wire connects to the brakes. I have ground, right blinker, left blinker, backup lights (this wire I believe should be the brake wire as well) and brake light wire. So my question is, what wire hooks up to the trailer brake? Its a 2000 Ranger trail.

 

I hooked everything up the way I thought was right. Hooking the backup wire to the brakes. When I had my wife pump the truck brakes, the trailer brakes didn't do anything. This is my first trailer with brakes, so I don't know how to make everything work. The only thing I did not do was connect the ground wire from the trailer brakes. I had both ground wires connected together. Any info would help. I have a big trip in 2 weeks and want to get this issue taken care of. Im a bad electrician

The trailer brakes are not electric, they are hydraulic, working off the piston in the coupler.  They only work when the trailer is pushing against the back of the truck while stopping.

 

The brake wire in the plug is for the brake bypass, so you can back the trailer up without the brakes coming on.  This is usually hooked to the reverse light circuit on the truck.

The trailer brakes are not electric, they are hydraulic, working off the piston in the coupler.  They only work when the trailer is pushing against the back of the truck while stopping.

 

The brake wire in the plug is for the brake bypass, so you can back the trailer up without the brakes coming on.  This is usually hooked to the reverse light circuit on the truck.

 

Thanks a ton. I was kind of figuring that was an option, but wasn't sure.