[V8] Charging question

[Dave Saad]

If the idle is normal, and the belt is not slipping, and the usual  
electrical issues all check out OK - like the battery to alt  
connection, alternator sense connection, etc, then you could have a  
bad winding or toasted diode or shorting (as opposed to shorted)  
rotor coil. Given the length of things to look at, I would be very  
tempted to just pull the alternator and have it tested by a good  
shop. They can easily tell you full output, ripple voltage and  
regulated voltage all at various RPMs. The testers at your typical  
FLAPS can not do this.

And of course when it is off the car, it would seem silly to me to  
not put in new bearings and brushes unless you know they are very new.

Dave


On Jan 15, 2006, at 8:43 AM, Ingo Rautenberg wrote:

> Lately I've noticed that since I got rid of all my vacuum leaks and  
> (more importantly) replaced the FPR, my idle hovers ~650 rpm ('91  
> V8 5 speed).  When the headlights and fan are on the headlights  
> will dim somewhat, the dash lights will also dim, and the fan motor  
> will slow down, with the battery warning light displayed until I  
> resume an above idle speed, when all is back to normal and the dash  
> warning light goes off.  So does that indicate the regulator/brush  
> pak?  Normally I would think that the alternator pulley was the  
> wrong size -- but I couldn't have the wrong size alt pulley, could I?
>
> Ingo
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