When I had my car in for a minor repair to my LBC mechanic last week I noticed
when he drove off to test drive it that one stop light was brighter than the
other. I didn't mention it to him but when I went to buy a bulb (1157) the guy
at the parts store said something about a burnt out bulb and I told him no it
was just dim. He said that indicated that the ground was weak to that bulb.
Sure enough when I fiddled with the bulb holder I found that it was making a
weak ground right where all of those spring tabs fit into the hole. When I hit
a good spot the bulb brightened up just like the other side. I sanded the hole
and the tabs and haven't had that problem since.
I'm gong to clean up every ground and bulb holder and bulb (dash, gages, etc.)
that I can reach since my suspicion is that oxidation, dirt, etc. (and hence a
poor ground) may be causing a lot of the dimness in lots of other bulbs.
Bud
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