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robbdmax 03-21-2005, 09:08 PM I just installed a trailer brake controller in my '05 2500 D/A. The harness came with a 40 amp fuse, but the directions said I don't need it if I have 2 batteries. I didn't install it, and my trailer brakes work, but my trailer interior lights don't. Is this fuse for the 12v+ feed that is always on? I read somewhere that this is the case, and the directions are just crap. I figured someone here would be able to answer this for me. ARICO100 03-21-2005, 09:20 PM HI THERE, That fuse is for the 12v feed to the back. it is in the black box under the hood. It may be covered by a sticker. look for a blank fuse. NCMIC 03-21-2005, 09:30 PM yep, that is what that fuse is for. It will charge your trailer battery as well. Diesel Dragon 03-21-2005, 10:26 PM The dierections that say not to use it if you have 2 batteries is for the gas engine's that have the 2 battery option. As said earlier look under the hood at the fuse box and look for the plastic plug with a B+ on it taking a fuse spot, pull the plastic plug out and install the 40A fuse in it's place and your good to go with 12+ to your trailer plug. ARICO100 03-21-2005, 10:31 PM Hi Diesel Dragon, What kind of pto do you have and is it on the trans? Diesel Dragon 03-22-2005, 12:03 AM Don't have a pto, just the pto switch that I use to turn on my high idle. It's the same switch that's on the cab and chassis :) robbdmax 03-22-2005, 08:23 AM Thanks a lot everyone! I'm glad I saved the fuse. ssduramax 03-22-2005, 09:34 AM I didn't install my fuse for that exact reason, two batteries, i guess i will put it in now, thanks everybody. sounds like they need to be more specific on that little sticker that comes wrapped around the fuse and cord. OmyLLwhy 03-22-2005, 02:10 PM Didn't put the fuse in and went camping, had 12v refer on and a dead battery by the time we arrived at the ocean. b_gable 03-22-2005, 03:18 PM Just put my fuse in. I hooked up the brake controller and did not install the fuse because it said not to install it if you have 2 batteries which of course the diesels do. I missed the part on the sticker that said for gas only. Glad there are so many here on the board to help. What did we do before the internet... I guess just believed the dealer or figured it out the hard way. Brad rudy fontana 03-23-2005, 04:43 PM That sticker confused me too. I keep the fuse just in case and now have it hooked up. Thanks for the info. Great to have people who these things. modified 03-23-2005, 10:58 PM My Jayco Dealer recommended only installing a 30A fuse at the STUD 1 Fuse location on my 2002. 30A is the size normally supplied with my camper. Your camper might be the limiter. | ||