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Old 10-21-2012, 06:56 AM   #11
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Originally Posted by Dave_Monica View Post
I seem to recall others mentioning having to add a fuse in the fuse panel to have power on the #4 pin (black wire) which would be the 12V power to the camper's battery. Perhaps your owner's manual covers it. Dave
Since the Original Poster (OP) did not mention which tow vehicle he has (either in signature line or profile), (that I found anyway), I am going to take a chance that it is a Chevy/GMC product and attach the information on how to "hot up" the trailer charging line that is disconnected from the factory. You may need to buy a 10mm nut with lock washer (M6 Fastener) to finish the install.

Since my 2008 GMC 2500HD came with the heavy duty tow package and the 5th wheel wiring harness, I expected it to be ready to tow. I was mistaken and needed to do the following to get the charging circuits ready.
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File Type: pdf Installing Auxiliary 12-Volt Feed to Trailer.pdf (457.4 KB, 15 views)


Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
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Old 10-21-2012, 07:40 AM   #12
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HE's got a 2012 F150

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Old 10-21-2012, 11:50 AM   #13
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Originally Posted by davidjb
HE's got a 2012 F150
Have never heard of any F150 set up from the factory to charge the battery. Look in your owners manual as I believe you need to add a fuse to the truck. It would still probably not pump out enough juice to cool your fridge though without draining the battery somewhat.

2011 Flagstaff 831FKBSS
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Old 10-21-2012, 12:30 PM   #14
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I have a 2011 f-150. U had the same issue and took all summer to figure it out even after going back to trailer dealership and Ford dealership. Two issues first Ford doesn't put in the fuse needed do look in owners manual and the diagram will tell you where the fuse goes. Also in your glove compartment or one of the other compartments you should have a little bag with two parts. One is a relay that is needed and also goes on the fuse box of the Ford. If you google this you will find all kinds if posts with the part number. Sad that it took me all summer to figure this out even after visiting the Ford dealership. Since I put the fuse and relay in my truck trailer battery charges fine and no more blown fuses in trailer!!!
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Old 10-28-2012, 11:10 AM   #15
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Just happened to be looking through dime things and found the part number for the relay at least for the 2001. It is AL3T-15A416-AA. Again if you google this part number you will find many links about this issue.

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