[DrG]

The previous reply sums up everything quite well. Electric trailer brakes require a separate brake module and if you think about it for a second, you will realize why a boat trailer wouldn't have electric brakes anyway. I think there is a key on the cover for the 7 wire plug socket that tells you what each connector does. You will not need the 12V+ terminal. One is probably a dead terminal so you could wire in a brake module if needed. The backup light terminal is to activate the surge brake bypass solenoid. My trailer didn't come with that but when I changed the old drum brakes to disc, the new master cylinder came equipped with one. It sure beats the old manual lockout method.

So what kind of boat did you get? I pull a 98 Tige 21i. With a well balanced trailer, you will hardly know it's back there, until you check your mileage.
David