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Old 07-11-2015, 08:43 PM   #1
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No power at the 7 pin trailer connector on a Class C

Over the past 2 weeks I towed a Jeep behind my Winnebago Access Premier without issue (Jeep tail lights and turn signals all worked just fine). Today on my last day I hooked up my Jeep and no turn signals, brake lights, etc.

I used a meter and it appears that there is NO 12v on the left, right and tail/running pins on the 7 pin on the back of my RV. Ideas? Suggestions? I tried checking the fuses but nothing jumped out to me.

Also, where is the brake controller? Could it be bad? I looked at the manual and it says it is located next to the steering column but there is nothing there.

Chassis: 2013 Ford E-450
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Old 07-11-2015, 09:11 PM   #2
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Are your RV tail lights, turn signals, and brake lights working?
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Old 07-11-2015, 09:18 PM   #3
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Yep, all RV tail lights are functioning correctly.

It is just odd that it worked 2 days earlier.....disconnected with working tail lights on jeep and then when I went to reconnect 2 days later (at RV park) no tail lights on Jeep.
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Old 07-11-2015, 09:54 PM   #4
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If you lost everything at once, it sounds like a ground problem. Did you test using the ground in the connector or to an independent ground like the frame?
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Old 07-11-2015, 10:01 PM   #5
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There are a couple fuse locations, did you check the fuses up by the radiator under the hood?
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Old 07-12-2015, 08:46 AM   #6
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may or may not be revelant, but on our coach, the 7 pin connection sources are separate from the coach lights .... there may be other fuses just for that ....
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Old 07-12-2015, 05:24 PM   #7
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additional fuses

You should have a separate fuse box for the seven prong trailer towing light socket - I found mine in the compartment with my inverter - different coach manufactures can and do put them in different locations. below are the pictures and description of where mine were hiding... good luck!

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 07-12-2015, 08:50 PM   #8
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Today I used my multi meter and determined that the ground was solid. Then I went and visually inspected fuses based on the descriptions from the chassis manual. All the fuses looked good. I then decided to start pulling fuses that were associated with the brake controller. Each fuse I pulled I tested and the 2nd fuse I pulled was blown. I replaced the fuse and found that the 7 pin connector is working correctly now!

Can a fuse blow/fail due to vibration? I want to find the source of the the blown fuse before my next RV trip. Given that it worked during one leg of my RV trip and not the next makes he question how this fuse was blown? Ideas??
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Old 07-13-2015, 07:40 AM   #9
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I've never heard of a fuse blowing due to vibration. It's more likely you have a problem with a shorted light on the towed vehicle or a poor connection inside either the socket on the motorhome or the plug from the towed vehicle.


We had a problem blowing fuses when we towed our Buick on a dolly. After a couple times I took apart the plug on the dolly. I found several of the wires had loosened up. The one for the brake lights had come off and touched against the ground. It only takes an instant to blow the fuse if the wires are touching when you step on the brake.
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