'71 Overlander Brakes locking in reverse.

[Jesse Irwin]

I'm on my honeymoon right now and we're just north of Mount Rushmore. While we were on the way here I tried to back up the overlander and brakes locked up! I disconnected the umbilical and they released. This happens every single time I try to back up the trailer. Has anyone ever heard of this problem?

[Inland RV Center, In]

Originally Posted by Jesse Irwin

I'm on my honeymoon right now and we're just north of Mount Rushmore. While we were on the way here I tried to back up the overlander and brakes locked up! I disconnected the umbilical and they released. This happens every single time I try to back up the trailer. Has anyone ever heard of this problem?

Sounds lie the back up light circuit is also feeding the brakes.

Andy

[richinny]

it is possible that your trailer plug or tow vehicle plug is not wired correctly. if the brakes do not activate going forward, the brake and reverse light wires might be reversed.

[richinny]

if the reverse light goes on when you hit the brakes in drive, check for a short like andy suggested.

these diagrams might help:
http://www.airforums.com/forums/f238...tml#post115411

the colors at each connector might not match and need to be verified.

[purman]

At least you won't roll backwards If it is the back up lights I would just disconnect that one wire and deal with it when you get home..

[Jesse Irwin]

Thanks everybody. I didn't realize that the color coding changed with a modern 7 pin flat plug. I got that problem resolved. Now I have another one...