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Old 07-08-2015, 05:20 PM   #1
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National RV Owners Club
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Problem and solution for 7 way towing light socket

I originally posted this in the National RV Owners forum - moving it over here in hopes the information might help somebody else

Problem with towing light socket
I have a 2007 National Tropical LX - We had an Invisabrake installed in our Honda Cr-V for toad towing. When the installer checked everything when he finished everything worked - no trouble. Now, I seem to have a dead 7 way socket on the back of the coach. I hooked up the CR-V to my truck and everything worked so I am sure the issue is with the 7 way socket. I have read many responses that all seem to point to there being an auxiliary fuse box for the towing wire harness but I'll be dipped if I can find it. Any help would be greatly appreciated.

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07-02-2015, 09:35 PM #2 stinespool

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Same problem here! I have lost lights one at a time. I thought there might be a fuse box but can't find it. I've gone back up the wire loom and tapped into wiring further up, and that has worked. I would like to fix it properly though.
Scott & Dawn 2007 National Tropical T330
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07-05-2015, 03:46 PM #3 tucson pappy
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Found the fuse box
I found the fuse box that houses the fuses for the towing light socket! On my 2007 National Tropi-Cal LX T350, the fuse box is located on the curb side in the back baggage compartment - behind the metal screen in with the Xantrex Inverter. There are two small fuse boxes mounted on the back wall - the one with the number 2 on it housed the fuses. I found 3 blown fuses, left turn/stop, right turn/stop, and marker. After replacing them the towing light plug socket works fine. Hope this information helps somebody else!
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Old 07-09-2015, 12:01 AM   #2
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Tucson Pappy,
Yep, there's lots of folks out there with similar motor homes that don't know they've got a separate set of fuses for that trailer plug. It took me a while to find them on our coach, an '04 Itasca Horizon 36GD with the C-7 330HP CAT. I finally found them, inside the rear, drivers side louvered panel, (the one for the dash A/C in our style coaches). When I did get to them, they were insanely hard to get to and service if needed.

So, I tore that entire area apart and re-located that fuse box so I'd have much better access to it, if and when needed. The first picture below shows what it looked like when I found it. The second one is how it looked when I got done with that arrangement.

2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '08 GL 1800 Gold Wing
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Sophie character, (mini Schnauzer)
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