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Old 06-30-2014, 11:57 AM
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Trailer Light issue

I bought a new boat the other day and the trailer uses a 5 pin flat connector. I bought a 7round to 5 flat convertor. Tested the trailer lights and everything seemed to work save for one of the side marker lights.

After loading the boat and coming home the lights no longer work at any of the plugs on the truck. The 7round / 5 flat is getting power to the reverse because the surge brake lockout is working. No lights whatsoever on the trailer though. All lights on the truck work fine. Trailer lights work on a different truck.

Ifound a blown 20a fuse in the slot labeled for trailer lights under the dash on the drivers side. I can not find any additional blown fuses. After replacing the fuse there was no change to the function of the trailer lights.

Any suggestions on where to start? I read there is a trailer related relay under hood, is this replaceable?
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Old 06-30-2014, 12:28 PM
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Check under the hood. I believe the '05 and up trucks have an additional under-hood fuse/relay box.
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Old 06-30-2014, 01:57 PM
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Anyone have an idea what size / type fuse would be under the hood. Truck is currently an hour away and there aren't any local parts stores.
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