Backing problem?????

[Nelly]

Alright, let me try and explain this, 05 Triton with UFP act. Hook it to the Yukon works flawless (backing). Hook it to the Duramax, when backing the brakes will lock up. checked voltage from pins in reverse (trailer not hooked up) 13 vdc all day long. hook trailer to truck and check voltage, drops to 10.4 vdc. re-worked grounds and still same problem. Talked to UFP, not enough Voltage to solenoid. Any suggestions?????????

[Kanuck1958]

Look for a poor conection or corroded wire on the truck reverse circuit

[Bugs]

On the D-Max are you going from a 7 pin round plug to 5 pin flat?
They may be a short or the reverse lead is not going to the correct pin.
Just a guess on my part!

This also may help: http://www.etrailer.com/faq-wiring.aspx

[Nelly]

for now, it has started working