2004 GMC 2500 D/A Crewcab, short bed, 4x4

I bought my truck used and I have transferred my prodigy brake controller from my p.o.s. dodge, I bought the adapter wiring harness and can use trailer brakes.

I just would like to confirm the red plastic plug in the fuse block under the hood is where I place this fuse. Will a 40 amp be too much or should I use a 30 amp. The trailer has a 30 amp plug. Also, in the manual it says not to place the fuse if you have a two batteries. This is my first of many diesels. I know it has two batteries but is it dual batteries or one battery with an auxillary.

I have done some research and reading of the owner's manual about the battery feed for the 7 way connector. My dodge (which was a hemi/lemi and was bought back by the manufactuer), had the battery feed wire already connected from the factory.

Thanks for all of your help in advance.

Yes the red plastic plug in the fuse panel under the hood is the one you pull out and put the 30 amp fuse in.

The adapter harness you bought is for a 04 chevy not your old dodge right ?

The 2 batteries they are talking about in the manual is for the gasser engines not our diesels

We have dual batteries wired together so you still have a 12 volt system just double the amperage of a single battery setup.
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Thanks for the reply, Just wondering.

Yes it was the chevy/gmc plug.

This saves me a trip to the rv dealership tomorrow morning.

Thanks again :grd: