AVid said:
The fuse in stud 1 is a feed for charging the RV onboard battery. The fuse in stud 2 provides power for the trailer brake controller which in turn powers the trailer brakes.
I just double checked this in the shop manual, and you are absolutely correct.
I have often been confused on these fuses, so I made sure to look it up before I posted. Unfortunately, I didn't look in the shop manual, but instead read the tag on the Z82 trailer harness which just happened to be handy.
(Someone else posted it, I don't know who, I will just reference their picture)
Now I know where my confusion has come from.
This states to install the supplied 40 amp fuse in stud 1. Silly me assumed that it was for the trailer brakes.
The shop manual wiring diagrams clearly state that Stud 1 (40 amp) feeds the battery supply to the trailer plug on pin E, while Stud 2 (30 amp) feeds the trailer brakes.
So, why would the fuse for the trailer brakes always be installed, but the fuse that does not go with the brakes is not installed, but included with the brake harness and referenced in the brake wiring instructions? Seems like they are trying to confuse people.
I'm sorry if I led you astray in my previous post, I have updated it to prevent future confusion.
Thanks for straightening it out, Avid.
-- SS