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Old 01-03-2008, 04:39 PM   #1 (permalink)
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300 6 alternator

does it have a built in regulator?
off an 87 truck
thanks tom
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Old 01-03-2008, 05:16 PM   #2 (permalink)
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Re: 300 6 alternator

Yes, my 87 F150 with the 300 6 cylinder had a built-in regulator. I think it was the first year that Ford started putting the regulator on the alternator. Mine went out when the truck was about 14 months old. iirc, it was about $20 or less to replace the regulator part.

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Old 01-03-2008, 06:05 PM   #3 (permalink)
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Re: 300 6 alternator

Not sure how Your '87 is equipped but My old '87 w/300-6 had a "Special Balanced" alternator, something to do with no O/D transmission and the higher RPM the engine normally ran at I think. I had about 4 alternators on it in 9 yrs & 120,000 miles. Three of them in two days!

Those alternators have brushes and the most common failure is the three diodes that change AC to DC...which I think are part of the regulator....if You have a alternator/starter rebuilder close I'd just buy a decent rebuilt.
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