Thread: Alternator HOT
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Old 05-21-2019, 01:53 PM   #29
RichardJ
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Join Date: Apr 2010
Location: So Cal
Posts: 1,413
Re: Alternator HOT

Your truck originally had a 10DN alternator. The 10 DN requires a separate, externally mounted voltage Regulator.
It is a very common conversion on these trucks to replace the 10DN with a 10SI or 12SI alternator. The SI alternators use a voltage regulator that is placed inside the body of the alternator itself. The conversion requires the removal of the external voltage regulator and a few wiring changes.

You have a 10SI plus an external voltage regulator. In short, you have a friggin mess.

Another thing that is common is that in 90% of the conversions are completely unnecessary and of those, most are performed improperly and result in complications and failure.
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