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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Alternator Problem or Regulator Problem or ??????

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Old May 8, 2003 | 08:36 PM
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Alternator Problem or Regulator Problem or ??????

My 1990 F150 is really goofy...when I start it up after setting over night, the volgate guage set way on the low side. I can tell the system is not charging, as the flasher is slow, and the wipers drag badly. Then, after a few miles (sometimes more) the needle jumps to the middle of the guage and everything is fine.

If I shut it off for an hour or two, it works normally on the next startup....it only acts goofy when it has set a long while.

I suspect a screwed up voltage regulator, but I don't know if this is internal to the alternator or external....

It is a 300 I-6 with Auto and AC....and ideas???? Thanks
 
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Old May 8, 2003 | 09:11 PM
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Alternator Problem or Regulator Problem or ??????

'90 used an internal regulator, but a poor rectifier. Most parts stores will test it free in the parking lot.
 
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