Had the same issue on my '17 210SPX OB. If you have the PMX-2 radio and the "Dimmer" button doesn't seem to do anything check if the Orange "Illumination" wire is wired to constant 12v. It was in my case which kept the radio in the lower illumination setting. You can either just cut the wire and...
Mike Blake,
I'm having a similar problem with my fuel gauge (the sender has already been replaced). Is whatever you PM'ed Michael general gauge troubleshooting info? Thanks...