I have a Winnebago 30b 2006 have lost all power to trailer hitch plug on MH all lights will not work is there one fuse that controls them all .It is a ford chassie there seem to be fuses for each set of lights ie stop,signal,and running.Any help would be great.Thanks
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As you feel you have eliminated the most common problem-- poor ground, the next step would be to check the connection at the point it ties into the coaches wiring. This is usually found near the rear of the coach tucked inside the frame rail. The wiring for the coaches lights etc, will have a connection that will be T'd of to the hitch plug. Because you have not mentioned any blown fuses, it seems likely that as you have eliminated the ground circuit, that perhaps it has simply become disconected. If you have not already done so confirm that all of the coaches rear lights are working as well.
You may have a fuse panel you haven't found yet. I did a bone head mistake and plugged in my toad power upside down and knew I blew some fuses. I looked high and low and couldn't find them. I finally had a tec. show me the fuses were located under a drawer in the back of the coach. Good luck.