[V8] Q Re Voltage & Alternator
dsaad at icehouse.net
dsaad at icehouse.net
Tue Dec 30 12:21:16 EST 2003
If it were me, I would pull the alternator and bring it to a place that
rebuilds them. They should have a good tester - not like the one at Shucks.
A good tester can tell you max current, ripple voltage, output voltage at
various RPMs, etc. All parameters mean something. Eg: if a diode or two is bad
you may have 13.8 volts output at lower loads but ripple voltage will be high
and max load will not be possible.
By your description I would suspect worn brushes.
Best case is you replace the bearings and brushes and clean up the slip rings.
Worst case is shorted windings or something that requires buying a whole
rebuilt unit.
Dave
Quoting RichardMor at aol.com:
> My alternator voltage output is right around 13.0 volts at all RPM's.
> It's
> not enough
> to keep the battery charged fully, but after a few days, looses enough
> charge
> to not
> start the car. Anyone ever experience this problem? I'd think if my
> alternator brushes
> were worn I'd see a fluctuation in voltage with RPM. Could this be a
> symptom
> of a
> defective regulator? Would appreciate any feedback.
> Thanks,
> Richard Morris
> Renton, WA
> 90 V8 Auto Dk Blue/Dk Blue
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