Could a improperly installed tail light cause my car to lose power?

1994 FORD EXPLORER
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VALVAL63
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car loses power, idles erratically, headlights dim when at a stop... but when headlights aren't on, car runs fine when at a stop... was side swiped and back tail light was replaced... could that be the problem?... had diagnostic performed and they were dumbfounded as to why my vehicle presents with current problem...
Jan 1, 2012 at 5:51 PM
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FIXITMR
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how is it improperly installed? does it work right?
Jan 1, 2012 at 5:54 PM
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VALVAL63
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i don't know if it was properly installed since i'm a novice... my dad saw all my lights dimming while my car was erratically idling... the odd thing is, this only happens when my lights are on
Jan 1, 2012 at 6:10 PM
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FIXITMR
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is your alternator charging ok? do the lights brighten when you rev engine?
Jan 1, 2012 at 7:02 PM
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VALVAL63
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the mechanic said he ran a diagnostic and everything was fine... would he of checked my alternator with a routine diagnostic? and yes when I rev the engine the lights brighten
Jan 1, 2012 at 7:14 PM
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FIXITMR
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ok, some sleuthing says you have a bad ground somewhere. like from battery to body/engine?
Jan 1, 2012 at 9:24 PM
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