Alternator Intermittently Charges the Battery

[Christopher Gharibo]

Changing a 6 month old voltage regulator fixed the problem. The two brushes
were 1/3 and 1/2 worn. 

Why does the alternator stop charging with plenty of brush left?

------ Original Message ------
Received: Sat, 30 Apr 2016 08:52:07 PM EDT
From: "Doyt W.  Echelberger" <doyt at buckeye-express.com>
To: Christopher Gharibo <cgharibo at usa.net>
Subject: Re: Alternator Intermittently Charges the Battery

> Replace voltage regulator
> 
> 
> At 08:19 PM 4/30/2016, you wrote:
> >Another issue on the '91 CQ: the alternator will stop recharging the 
> >battery intermittently. The voltage will drop from 13 to 10V and the 
> >battery light will come on and the car will run on battery power. 
> >The alternator brushes are almost-new and the belt is tight. The 
> >alternator is about 15 years old. What's the next step? New 
> >alternator? Thank you. CG 
> >_______________________________________________ quattro mailing list 
> >http://www.audifans.com/mailman/listinfo/quattro 
> >http://www.audifans.com/kb/List_information
>