[medcrest]

This is a "long shot" but....Maybe there was a spot light mounted to your coach at one time. I had one back in the day which had a wireless controller for aiming the light.

The power source for a spotlight was used for (I think) the satellite phone, according to the fuse list and there's no sign of a spotlight on the roof.  I read how to get the top of the dash off in a different thread and will try that this weekend.  Maybe with the help of flex fiberoptic I can visually trace the wiring.  Thanks for the suggestion

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Paul,
Looks like an add on, so good luck.

My coach, same era as yours, also had a treasure trove of Motorola old school mobile phones components hidden in different compartments.

I'm trying to get that stuff out of the dash with the least collateral damage.  The wiring for the phones came up through the same opening as the jottodesk tower.  I'd prefer to disconnect--I don't like cut wires floating around.  Wish me luck.