Troubleshooting Boat Trailer Brakes Locking Up in Reverse

Question:

I have a 2006 Mastercraft boat 23ft on a mastercraft trailer. Sometimes when I am backing up the brakes lock up and will not go in reverse. It has done this when being towed by my motorhome with a 5 plug adaptor to 7 to match the boat and also done it with my 2012 ford f150 that has the 7 plug that matches the boat. Have been a customer for years but never needed this expert help and am hoping you can give me some pointers BTW we are going to rewire the motorhome to a 7 plug which I bought from you a week ago. I am going to use metal because the plastic breaks to easy.

asked by: Edward B

Helpful Expert Reply:

It sounds like your reverse lockout solenoid is not working properly. You can use the Replacement Solenoid Valve for Titan Brake Actuators with Reverse Lockouts # T4748800 or the slightly better designed Demco # DM5837. You will wire one side of the solenoid to the reverse light function on your 7-way and then the other wire will be grounded to your trailer frame. I've attached a couple videos of installations to assist.

I've attached a photo of the 7-way pin locations to assist.

expert reply by: Jason S