You said the radio has a separate circuit for dimming it's display. That would have to be wired to the rheostat for it to work. I would start by disconnecting that dimming circuit wiring and see what happens.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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