UPDATE - Is it the battery or the alternator that's at fault?

[Huw Powell]

> I measured the voltage across the battery with the engine off, It read 12.2
> volts which indicates a good battery as you say.  I then cranked the engine,
> the battery voltage now measured 13.8 volts which also indicates the
> alternator is providing a charge to the cells as suggested.

12.2 does not sound very good, I'd rather see 12.6.

When you load up the engine are you leaving it at idle the whole time?
The alt just may not be able to keep up with all that stuff at low rpms.

--
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/