by matthewh » Fri Nov 09, 2018 3:09 pm
Make sure you run a fuse or circuit breaker when pulling your power, I typically run a 10ga wire to the battery, and prefer a breaker to a fuse, but it's up to you. I also like to run my ground right to the battery as well.
Same for the wire to the rear, run 10ga, to keep the wire size the same, from the controller, as well as the trailer. You'll find the brake wire and power are 10ga, the other 2 are 12ga.
2nd gens didn't come 100% wired in till late 95. Just wired my plow truck, and while it had the relay in the underhood box, didn't have the under dash wire/plug to tap into like the later models years did. After a couple hours trying to test wires, I just ran a wire to the back and spliced into the factory plug for the brake wire, and ran power/ground off my battery. Truck is a early 95 V10
'93 W350 5spd Getrag, 4.10 gears, 83k miles and counting, Mods: LPPP AKA Ma Dually
'54 Dodge M37 6.2/700R4/205, 5.89 gears, WC rear axle