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**Mike Harvey** · #4 February 17th 09, 03:03 PM

Quote:

Originally Posted by Ron Rosenfeld

On Mon, 16 Feb 2009 21:41:07 +0000, Mike Harvey
wrote:
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A fully charged 12V battery should read 12.7V with everything turned off
for a few hours. So either there is a significant voltage drop to your
cigar lighter, or your voltmeter is not accurate.

You could have loose or corroded connections anywhere in the circuit.

What kind of alternator? -- the original had a generator, but there have
been STC's for various alternator mods.

I've not had noise as a radio problem (in my 65 M20E) with 13+ volts on the
bus (KX155 radio). With low voltage (under 11-12 or so, can't recall
exactly), the first thing that seems to go is the squelch.
--ron

Thanks for the response. It could be a bad connection to the ground. As previous stated and to further clarify, I usually keep a trickle charger on the battery and when I first go flying the battery before starting is 13.5 volts. and no noise on the radio. When I get back the voltage is 12.5 or less and I get noise on the radio. I've had a tech check out the antennas and no problems and com1 was recently overhalled last year. Com2 does not experience any problems. I don't have a generator but I don't know what type of alternator it is. Need to look at the log books

Mike