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Re: 99 Alternator & Regulator Diagnosis
Posted by Larry West (more from Larry West) on Mon, 30 Jul 2001 22:17:59
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>1)  does the 78 '99 have an outboard regulator ? if so where is it ?  I
>have a Bosch not an SEV alternator.

Depends on the year. If you see a black plastic block in the back of 
the alt, and only two wires going to the alternator, then it's 
internal. If you see a block with 4 wires coming out of it, that's an 
external regulator

>2)  Before this happened the light would come on, i would give it a quick
>rev, it would go out and stay out.  Is this an indication of something ?

There are two wires on the back of the internally regulated 
alternators. One is the big wire that is held on with a nut, and that 
carries the charging current. The smaller one is the exciter for the 
field, and that one is a slip-on connection. If that one is broke, 
then the alternator can exhibit symptoms like these.

Oh, wait, there is (or may be, I forget on the 99) a third wire that 
connects the case of the alternator to the block to ground the 
circuit. I know this is on 900s, it may not be on 99s, as the 99 
alternator is not supported in rubber bushings.

>3)  Are there any tinkerers out there who have replaced the diodes in a
>Bosch KV-20 alternator ?  If so any hints or tips would be
>appreciated.  Thanks,  Dave

No, but then most of us would find it easier to just get a rebuilt of 
a junkyard alternator.
-- 
Larry West
NJ Saab Owner's Club

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