Quote:
Originally posted by J&MStang
My recollection is the marker lights go out when the headlights are turned on. It's a function of the headlight switch; grounds have nothing to do with it unless your lights are not working at all or are flickering.
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you may be correct as far as the intent, but grounds have everything to do with light failures. it is very common, especially in a vehicle where the grounds for multiple lamps meet at a central point, for one to "lend" it's ground to another that has a poor connection. Admittedly, this usually results in one brighter than normal lamp, and one duller than normal lamp, but when one is a headlight, and the other is a parking lamp, it's entirely possible.
BTW, FYI, next time you see a car with one overly bright headlight, and one barely lit headlight, you can save the day by correcting the ground for the bright headlight. It will be the one with the bad ground.
Take care,
~Chris