Mike Harvey writes:


Hello, I own a 65 m20e with a io360. Recently been experiencing noise
on com1 and have read about low voltage being a problem with nav/com's.
I have a king ki 165 for both com1 and com2. I've tried to diagnose the
problem and it appers that my alternator isn't charging the batter
correctly nor is it bringing the system bus up to 14volts. I've
noticed this via a volt meter to the 12 volt(car type) adatper(although
i don't know if this is the correct procedure) and I've also made notes
of the bus voltage before starting and after shutdown on a long flight
and it went from 13.5 volts to 12.2 volts(enging off). Does this seem
like it could be a low voltage noise from a alternator not charging
correctly. If so has anyone had experience repairing alternators on
m20e. I would imagine a new one would cost around 1K. But I don't
know.

First, clean and tighten all the connections, most especially the
battery ground, engine to frame strap and regulator grounding.


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A host is a host from coast to
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