100% correct and I am not disagreeing. You may very well have identified his problem.

And I never claimed to be better or smarter than you or anyone else. I'm just pointing out that switches can be very easily tested instead of rushing to replace. Living over an hour from the nearest auto parts store leads me to test first. But a dimmer switch is also cheap and easy to swap, I entirely agree, so if convenient to obtain, replacing can also be an effective test.

As for your wire harness comment...you've never seen my car...you have no idea what problem I was trying to fix. My Bird was purchased as a partially complete project/not-even-rolling chassis. About 60% of my wiring and all connectors were fully missing. So indeed I threw a pair of new aftermarket harnesses at that problem instead of attempting to plastic-mold firewall and other connectors and plugs from scratch LOL...several other harnesses I indeed fixed instead of replaced...