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Oldsmobile Ninety-Eight
VW Jetta
Ford F-150

Why would the alternator on an Oldsmobile Ninety-Eight stop and start during travel and not operate at 4am but start at 10am if it has been changed twice?

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2008-05-15 00:31:46
2008-05-15 00:31:46

I had the same problem...my battery was low. Maybe check that! == == Assuming that you were not unlucky enough to get 2 bad replacement units in a row, then 2 things come to mind. There is a broken or chaffed wire in the harness that comes to the alternator. Not the major output wire, but the smaller control wire plug and harness. Also, depending upon whether you have a gauge or only an idiot light - there is this possibility. Some alternators will not start up on their own - the output needs a reference voltage level to make them start to charge. This is often provided by the circuit thru the idiot light which comes on when you 1st turn the key on. If the bulb is gone or a wiring problem occurs here, then the alternator may not kick in as it is designed to do because it has no voltage level to trigger the internal regulator function.

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