In my experience,, most of the time dim lights on two filament bulbs are
caused by a bad/missing ground causing the current to flow thru both
filaments to reach ground (making them at as resisters)instead of each
circuit going thru filament to ground. Bob
>
> I recently noticed that one of my taillights is dimmer than the other one
> (left one is dimmer). Only the rear park light and brake light are dimmer,
> the rest of the lights are evenly bright. So I did the usual diagnostic
> process, swap left and right bulbs, swap left and right bulb holders,
> measure voltage, etc. No apparent faults, it's always the left light
> that's
> dimmer, voltage is the same at each light.
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