The car headlight and dash lights will get bright. At the same time the heater fan will run faster. Then they all go back to normal. it even blew out a headlight the other day. Is this most likely the alternator or is it a grounding issue?
Start by using a volt meter to check voltange at battery while the engine is running. If you are much past 14.5ish you could have a bad voltage regulator.
Alex
Yes - indeed the alternator or ground circuit 'might' be the culprit - however:
Only through *hands-on* testing / diagnosis by qualified personnel can this problem be accurately determined.
Recommend having local auto repair facility mechanic check it out.
Good luck with it!
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