Electrical meltdown/charging issues

Bernie Benz b.benz at charter.net
Fri Sep 28 07:24:01 PDT 2007

On Sep 28, 2007, at 6:12 AM, Feelstranger wrote:

> Folks, I hope someone has some ideas for me.
> Shortly after the electrical smoke event my SO experienced, which  
> never recurred, nor could I find any evidence of at all (besides  
> the smell)....
> This happened -
> Charging system failure.
> It is intermittent - start the car once and all is well, drive out  
> driveway, and lights come on.  Other times lights are on at startup.
> Alt has new brush pack.
> Alt output was measured at 11.+ volts - not just a dash light/volt  
> gauge issue.
Check the regulator for a good ground to the alternator frame, and  
the alternator to engine ground.
> Performed tests listed in Bentley - Current to exciter circuit  
> (blue wire to Alt) is apparently not in spec.
> Bentley simply says "replace printed circuit board"
> referring to the instrument panel board.
The blue wire from the alternator is not an exciter circuit. It only  
supplies a ground path and a charge bucking voltage to light and  
extinguish the no charge idiot lite.
> I inspected the board(s) and everything looks great.  No signs that  
> anything here melted down either - no obvious bad solder  
> connections (except the classic speedo connection)
> I even installed another board I had that appeared identical, to no  
> avail.
> Has anyone dealt with an issue like this?
> Can anyone elaborate on the exciter circuit once it enters the board?
> I'm in the middle of moving out of my house of 8 years this weekend  
> and don't have time to tinker!  Think I'm going to have to tow it  
> to the new place, instead of using it to tow the trailer!
> Thanks!
> Nat
> Vermont
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