Over Charging Alternator- Where is the regulator

Over Charging Alternator- Where is the regulator

08-20-2008, 10:59 PM

#1 (permalink)

ATaylor

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Join Date: Jan 2008 Location: Placerville, Ca Posts: 21

Over Charging Alternator- Where is the regulator

Hi,
Having a problem with a 1991 D250 CTD. The alternator stopped charging so we replaced the alternator. The new alternator was over charging and boiling the battery. Took the new alternator back and replaced it with a new one, but same brand. It is still over charging. It has 14.8 volts at idle and
17.7 at high idle speed. The amps were in the 50's at idle and well over 100 at high idle speed with no load on the battery.

1. On 1991 trucks is the voltage regulator in the alternator or external?

2. Does the PCM regulate the alternator?

3. If the PCM is the regulator can it be fixed or does it need to be replaced?

Thanks for any input that you can offer.
Archie

__________________
1995 Regular Cab 3500 SLT, 2WD, AT, 88K
Mods: Amsoil Bypass & Oil, Accusump 3 qt. Pre-Luber

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