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Old 05-20-2016, 11:38 PM   #1
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Location: Albuquerque, NM
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location fuses for trailer tow package and of wiring for trailer brake controller

I have a 2013 holiday rambler 40 DFT. When I first started towing my car, I hooked up a temporary wire from the 12 v pos lead in the 7 pin connector to keep the car battery charged. The mistake I made was to leave the key on in the car overnight and some lights and it discharged the battery in the car. The next morning when I started the motorhome it sent a large surge to the car battery which blew a fuse. I have not been able to find the location of the fuse in the manual. When I had a car braking system installed , the installer used the trailer braking wire in the 7 pin connector as a battery charging wire. He cut the wire and taped up the end that goes forward and connected a 20 amp fuse to the engine batteries to the end that goes to the 7 pin connector. This has worked fine for towing the car but if I want to tow a trailer, I cannot use the trailer brakes. If I can find the location of the fuse for the 12 v connection and also the location where to install the trailer brake controller, I could do both. Any help would be appreciated.
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Old 05-21-2016, 07:39 AM   #2
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If you have a Freightliner chassis, you can turn on the blinkers and listen for the click, click, click of a relay. On my Freightliner, there is a black box with fuses and relays for the trailer connector.
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Old 05-27-2016, 12:55 AM   #3
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Location: FL
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You probably have it fixed by now but as suggested, listen inside the right rear compartments with your turn signals on. You should hear the clicking of a relay. Do this without the engine running of course.

This schematic should give you some hints.
Attached Files
File Type: pdf Fuse Rear Distribution Panel.pdf (72.2 KB, 62 views)
File Type: pdf Fuse Rear Distribution Panel Harness.1.pdf (78.4 KB, 54 views)
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08 HR Endeavor 40 SKQ
400 Isl, 400 HP/// Now 450 HP
2016 Ford F150 Limited V6 with Ready Brake
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brake, cat, fuse, tow, wiring

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