As mentioned in other threads, I've ordered and am getting ready to install a brake controller. My truck has the two package, so the connector is ready to go under the steering column and I received the truck-side harness from the dealer. The controller will come with its harness, I'll solder them up, and be ready to go. However, I didn't know at first if the truck had a fuse inline with the connector or if I needed to put in my own fuse/circuit breaker.

I opened up the fusebox in the engine compartment this morning and found two fuses that seem related. One is #12, "Electric Brakes", and the other is #19, "Trailer Tow". Both are installed and both are 30A.

I presume that #12 must fuse the line running to the controller connector under the dash, while #19 must fuse the 12V line running directly to the 7-pin connector back on the bumper. But none of the documentation explicitly states this. Can anyone confirm?

Also: Has anyone found circuit breakers to replace those cube-shaped 30A fuses? They make CB's for most other automotive fuse styles but I've never seen this particular shape/style before.

Thanks!

 

If you have a volt meter, go to your trailer plug on the bumper and see which pin is 12v. Then pull fuse #19 and see if the voltage at that pin disappears. Probably will.

You could do the same thing with fuse #12 and the controller plug under the dash.

 

Precisely what I intend to do when I get home. I expect the results you describe.

 

Per the wiring diagram Fuse #12 which is 30A feeds to the brake controller plug while fuse #19 which is also 30A feeds to the trailer connector at the back of the truck.

 

Where did you get the wiring diagram? Is it online somewhere?

EDIT: Found it, in the 2006 PDF file. Thanks for the reminder!