>A23-24 ma276, having a problem. During runup, voltage positive. In the
>air, the ammeter goes negative. After an hour flight, battery wouldn't
>start the plane, but after a charge the battery holds a charge and will
>start the plane.
>Does the problem sound like a voltage regulator problem.

This isn't enough information to make an informed decision.

What is the battery voltage when fully charged? (engine off)

What is the bus voltage in flight, or above 1500 rpm on the ground?

(extra credit) What it the Field voltage (at the "F" terminal) on the
regulator with the engine running? Don't do anything dumb, tap the F
terminal and read it remotely.

Or read my charging system troubleshooting article (for Grummans, but also
applicable to Musketeers) on the www.bondline.org site.


Bob Steward, A&P IA
Birmingham, AL

Join BAC today and be a part of the ONLY Type Club for the Musketeer series!


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