Cat alternator not charging

[Harold Prescott]

Don
This alternator has been changed to a Delco....?amps.
I read across the alternator and found it's charging well. 12v or more.

With the engine running and nothing turned on I show a minimal
discharge. (probably from the clocks etc.) However the voltage drops
to about 11.75v.
I believe the reason for the low voltage after a start is related to
starting the eng.
However when changing from shore to coach power I'm not getting a
charge from the cat alt.
It charges with the genset just fine.
Is there a breaker that is failing to make the switch from shore power??

Harold Prescott
'85FC35
Marysville, Ca.



--- In WanderlodgeForum@yahoogroups.com, "w3ww" wrote:
>
> Harold,
>
> Before you do anything, check the voltage output at the alternator.
Check it at idle and also check at 1500 or higher RPM. Those older
Motorola (I think that may be the one you have) alternators seem to
drop to about 10-11+/- volts at idle and generate 13.8+/- at higher RPMs.
>
> FWIW ....I thought I had a problem with mine and went to the trouble
of taking the alternator off, carting it to a NAPA test facility only
to have them tell me it was performing normally and it looked fine.
>
> Don Mohney
> 87FC35
> Jensen Beach, FL
>
> [Non-text portions of this message have been removed]
>