John,
test the alternator at that RPM, it is intended for.=20
If you have 6v 3000 RPM motorcycle alternator=20
then it is OK.
 Find 12v alternator of low RPM engines or change=20
if possible transmission ratio from engine to the=20
alternator to increase RPMs.

   Cheer up. Mike.

John Dammeyer wrote:
> The manual states the procedure on how to test the output of the
> alternator and that's what I did.  At maximum engine RPM the=20
> alternator
> produced about 3VAC.
>=20
> It's possible that at some point I may have inadvertently shut off the
> Master Battery switch while the engine was still running.  This would
> have disconnected the battery from the alternator output and blown the
> regulator which in turn took out the windings.   It's a common problem
> on boats with master switches and Diesels that don't care if they have
> electricity for operation.  This "Load Dump" can be prevented=20
> by putting
> a hefty transorb on the output of the alternator regulator to keep the
> voltage within some safe point.  Given that this diesel is=20
> from the mid
> 70's the chance of it surviving a Load Dump is pretty=20
> unlikely.  So more
> than likely I shot myself in the foot.
>=20
> That's one reason why I would like to have a system that has high
> voltage diodes and regulator transistors to be capable of=20
> with standing
> the Load Dump voltages.
>=20
> Sigh....

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