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Old 04-17-2022, 11:39 AM   #1
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Location: Vermont
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Why? why? internal lights won't go on

I have a panel 5 buttons on my console. 1. door opener 2. heater 3 internal lights 4. step heater 5. rear stobe lights

When I turn the bus and the headlights on, the panel buttons will light up. If I turn on anything else on the panel except the door opener or the heater, the panel button lights go off and nothing will work.

When I hit the heater button first , the heater goes on but when I hit the internal lights button the interior lights the heater shuts off and the lights in the buttons go dark.

If I leave just the heater on, after a while the heater kicks back on and the lights in the buttons will light again.

I thought that I heard a clicking in the engine compartment when I would turn the light on.

If I shut the engine off and back on, the button lights will light back up.

I was wondering if it could be some kind of capacitor or something. I did pull the panel and checked the connections but that didn't seem to be it.

Any ideas what could be wrong or anyway to do a test that would find the problem??
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Old 04-17-2022, 01:12 PM   #2
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Is that something someone added, or the way the bus came (from the builder / manufacturer)? Whatever it is, there's gotta be one or more pretty heinous wiring errors somewhere in the path(s) between these switches & the circuits they control.

The backlighting for the switches should be independent of the circuit each switch controls. The fact they're not is puzzling. The behavior you describe (coming back on after a time period) is even more puzzling. Maybe somewhere along the line there's a relay that's getting stuck open/closed, or maybe even a latching relay where one shouldn't be? Still doesn't explain the lights tied w/ the circuits, but it might explain them 'resetting' after a time period or after you key-off/key-on.
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Old 04-17-2022, 01:29 PM   #3
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It seems like there's some kind of shared ground or something that shouldn't be the case kicking into effect--probably caused by a short somewhere.

The clicking bit, though, seems like it might be a relay or something.

The other other thing I can think of is that, for some reason, your #3 switch and beyond are shorting out the whole circuit when they should all be isolated. There seems to be some crossover happening somewhere, and I would put money on it being in that switch or somewhere very near it--at least electronically, if not mechanically; that's where my money is.
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