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Old 08-09-2014, 04:56 PM   #1
Junior Member
Join Date: Jan 2013
Location: Albuquerque, NM
Posts: 17
Fuse location for trailer connector wiring

I have a HR 2013 Ambassador 40 ft motorhome with the real bath and a 1/2 powder room toilet across from the residential fridge. The connector on the back of the motorhome for connecting lights etc. also has a live 12 volt connection to keep a battery charged if you are towing a trailer or a toad. On a recent trip, I must have blown a fuse somewhere for the 12 volt power pin. The stop lights, tail lights, turn signals all work properly on the trailer but no 12 volt power. Any one knows where the fuse may be located?

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Old 08-09-2014, 05:06 PM   #2
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Join Date: Jun 2012
Location: Merritt Island, FL
Posts: 1,742
Many times that 12v is for the electric brakes. Did you happen to turn off a switch on the dash?
If it's a direct 12V wire then I'd look for a wire connected directly to the batteries with an inline fuse.

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Old 08-09-2014, 05:34 PM   #3
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Join Date: Jun 2003
Location: Northern Illinois
Posts: 117
I know there is a big age difference between your 2013 Ambassador and my 2006 Diplomat, but I have found that some things don't change much over time. The fuses for my 7 pin towing connector are in the electrical cabinet (accessed from the outside) just below the drivers position. There is a large panel located there with many of the coach fuses inside.
Hope this helps.
2006 Diplomat 40DST
2014 Honda CR-V
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Old 08-09-2014, 08:38 PM   #4
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Join Date: Jan 2013
Location: Albuquerque, NM
Posts: 17
Thanks for the replies. The toad brake installer did what Gorlininc suggested and used the blue wire for the trailer brakes to apply power for the battery. This works fine for my toad but now I want to use the blue wire for trailer towing and the black wire for charging batteries. I suppose I could reconnect the blue wire which the installer cut and use the wire and fuse that the installer put in for battery charging connected to the black wire. I will also have to rewire the 7 pin on the toad. I did find a 5 amp fuse related to trailer as suggested by Justlou in the compartment under the drivers area but the fuse tested OK. It must feed a relay and another fuse that I have not found yet. My next step is to purchase a trailer brake controller and find out where to hook it up. Hopefully the Ambassador is already prewired. Thanks for the help.

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cat, fuse, wiring

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