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(Ron Thornton) wrote in message ...
The only thing that is normally common to both alternators is the
grounds. Check with an ohm meter from the negative battery terminals to
the alternator grounds. If your meter leads are not long enough, extend
one with something like 14-12 gauge building wire.

Ron

Also, Could be intermittent problem with the regulator.Some boats have
a single regulator for both alternators. That is what is in between
your alternators and the batteries.

Alec