No Trailer Running Lites 2007 E-450 RV Chassis

[fayrankin]

No Trailer Running Lites 2007 E-450 RV Chassis Actually, the trailer is a towed car. The car has been wired with diodes and all that jazz directly from the 4 pin connector at the grille to the tail lites. A factory made 7 to 4 lanyard connects the car and the MH. I check turn and brakes every day before running but never worried about running lites as we never tow after dark. I assume they worked at one time. Anyhow, a couple of days ago for reasons I no longer recall, I checked the running lites and have none. 2 days of rain and fog since-oh woe!

In my checking so far, I have concluded that I have no power to the running lite pin in 7 pin connector so the problem is likely in the MH chassis unless something further along in the toad caused a blown fuse. I found a blown 20 amp fuse under the MH hood in the fuse and relay box to the right hand side , Nothing changed after changing it and it still appears to have no voltage on either side of the new fuse. There is also a relay in the box relating to running lites. I traded this relay with another relay of the same configuration that i deemed was not being used and still no go. The underdash fusebox is a nightmare to see and reach but I cannot determine any fuse there that comes into the circuits I'm working on.

Of course, I make the checks with the head lights on ,engine running and all MH lights are on. How many switches, relays and fuses come into play when I turn on the headlight switch and expect there to be 12 volts at the running light pin on the rear bumper? If anyone could supply a wiring diagram, that would be wonderful. I'm thinking I'm going to end up paying a pro but would like to be able to channel the effort in the most effective directions.

Praying for sun in SE Texas tomorrow and all the way to FL

Thanks

Frustrated on the Road

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[rgvtexan]

Do the running light on the MH work? They should triger a relay that gets power through a fuse to the battery.