Don, what is your battery voltage?  If you have a failing battery it can
give you a low voltage figure from the alternator.  If the battery is
12.5 volts then I would say, try a new voltage regulator and see what
happens.  I have tried it many times.  Very few times does it actually
work, as the main culprit is usually the bearings going bad and allowing
the shaft to tilt, but if yours is a recent Bosch rebuild and the
bearings are good then it could be the VR.

Let me know if I can help you further.  I can do a new one for you for $29.

On 2/3/2011 1:43 PM, Don Hanson wrote:
>    My bosch alternator,  a rebuild  just a few years old, is giving me 13.10
> +/- volts at the passenger side (starter) battery terminals.   I am thinking
> "new Voltage regulator"...right?  When I add rpms or load (turn on
> headlights)  nothing much changes with the voltage.  anyone care to comment
> or confirm that another regulator is the 'right stuff?"
>
>    Don Hanson
>

--
Thanks,
Ken Wilford
John 3:16
www.vanagain.com
Phone: 856-327-4936
Fax: 856-327-2242