Alternator light comes on when you turn the fan.

Tiny
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  • 1999 FORD AEROSTAR
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Alternator light comes on when you turn the fan switch on, no matter the seed of the fan, motor blows air no wierd noise?
Monday, December 3rd, 2012 AT 11:51 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,738 POSTS
Most likely there's one defective diode inside the generator. That will reduce its maximum output to exactly one third of its rating, and that's not enough to run the entire electrical system. Have the system professionally load-tested. If one of the six diodes is bad, "ripple" will also be very high.
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Tuesday, December 4th, 2012 AT 1:15 AM

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