View Full Version : Trailer to Ford wiring

03-10-2008, 03:52 PM
I have a 2005 X10 trailer attached to a 2003 Ford F150. I The connection to the Ford is via a 7 pin circular connector. The problem I am having is the boat brakes lock up when I put the Ford in reverse. The only solution I have found is to reverse the connection. of the intermediate connection. Has anyone else encountered this problem and what can be done to fix it?

03-10-2008, 04:17 PM
The blue wire to your master cylinder solenoid is probably not hooked up properly to the back up light wire like it is suppose to be.

03-10-2008, 04:23 PM
I seem to remember a MC mechanic who sits on the MC service advisory board mentioning that they had a lot of problems with the reverse lockout solenoid. Might want to take a look at it as well.

03-10-2008, 04:52 PM
I can tell you what your problem is. My truck did the same thing, it turned out being the relay that controls the brakes (under the hood) went bad.

03-10-2008, 05:29 PM
Make sure your adapter plug is a round 7 to a flat 5 terminal plug. If using a flat 4 terminal your backup solenoid will not engage.