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Re: Can a dimmer switch be bad, but still work?
You could also have a amount of corrosion at any connectors in the lighting system.
I went through my old truck and cleaned up all the grounds and the packard connections. My lights do dim ever so slightly when at idle in gear yet they are as bright as the day it came off the showroom even at 47 years with original alternator and wiring.
Its amazing what a little cleaning can do!
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