No Coach/Body Running Lights #5000

[cmeservey]

I have 2007 Thor #5000 28' coach.
Running lights on coach body have stopped working. Running lights through towed vehicle connection also inop.

Cab headlights, DLR, turn, running lights all work and function as designed.
Coach body turn signal, brake lights work as well as towed trailer connection for same.

Fuses all good, both under hood fuse box as well as under seat Coach fuse box.

At one point, sitting in parking lot without lights...coach running lights came on. Drove about 45 minutes and they quit and have not come back on.

Looking to forum for majic wand....help.

[The Gritz Carlton]

Sounds like a ground is loose somewhere. Power is being distributed OK but vibration is causing a ground strap to jiggle around.

[cmeservey]

thanks...don't think that's it though. I'll check

[JimOIB]

If it isn’t a ground issue then it is a connector issue. Have you been in heavy rain or had water leaks in the past few days?

[cmeservey]

no water (odd as it seems living in the Houston swamp).
Also noticed no instrument lights, yet odometer reading will dim with control when headlights on turned on manually.

Headlamp switch do in today.

thanks for ideas