Easiest check is the voltage regulator.
Take it off and look at the brushes.
If you have a spare reg, pop it on.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
John Rodgers
Sent: Sunday, August 09, 2009 8:37 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Alternator Light Just Came On

Cruising down the road today - suddenly the alt light came on. Battery
had enough juice to get me home.

Alternator Type - Beck/Arnly Reman.
Checked the Alt belt - it was good. Tension was good
Checked the Batt. It was good. electrolyte up to marks. Charged battery
- it was low after running without Alt charging.
Cleaned Batt box - adjunct to charging the battery.
All terminal posts were already cleaned in earlier maintenance - clean
metal to metal contact.
Lights, turn signals, OX light and Alt light all work.

So, where do I go from here? I'm pretty weak on the charging system. Any
offering would be appreciated.

Thanks,

John Rodgers
88 GL Driver