Quote Originally Posted by schuylski View Post
It seems like anyone who has to back up an incline runs into this issue. My dealer looked at me funny when I said the reverse solenoid wasn't working right - he said none of them do. Told me to put in the little metal lockout disc and problem's solved... BUT the problem is when you stop going down a hill, need to back up, and the brakes are already engaged... disc doesn't fit and requires quite the gyrations with chocks (feel like I'm doing several chinese fire drills) to get things going.

I had some wire and went through connecting each prong on the vehicle to the running lights to see which one was which. I've got the 7 flat on the vehicle, and then a 7-5 adapter to connect to the trailer lights. Also found this diagram.


Neither the brake or reverse light prongs are powered when I'm in reverse. It doesn't help that when I ask other people about the issue - they think I'm talking about electric trailer brakes and go into a whole spiel about them.... It sounds like basically you just want the "purple" backup lights wire on the vehicle to connect to the blue trailer brake wire?? So when I'm in reverse, the blue wire on the trailer is powered. Is this right? OR should the blue wire on the vehicle control this?
The middle pin should control your trailer brake solenoid. It varies in color on different vehicles I would guess but on your trailer side of the connector you need to make sure that the wire that controls the solenoid (blue one is what everyone is saying) is wired to the middle pin on the connector. The trailer brake wire is for electric trailer brakes which we do not have. When the solenoid wire on of trailers sees 12v from the reverse lights it activates and will prevent the brakes from locking up in reverse. So on your diagram the purple reverse light wire needs to connect to the blue solenoid wire on your trailer and they should both go thru the middle pin.