Dynon Skyview shows Negative amp irratically of between -4 amps and -56 amps.... Voltage shows reduction from 14.5 volts down to 12.4 volts.

johnso29

I love flying!
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Oct 10, 2014
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VA99 Ophelia, VA
Dynon Skyview shows Negative amp irratically of between -4 amps and -56 amps.... Voltage shows reduction from 14.5 volts down to 12.4 volts.
 
Are you saying that the voltage is dropping at the same time the amperage is going high? That would indicate a short circuit somewhere.
I agree with Airguy, my ‘short circuit’ incident suddenly manifested itself , after 18 years, with the Aternator ‘B’ wire massively shorting out & cut through #1cyl temp probe. 😳. I had not noticed the wear on the snap bush as it was also ‘protected’ , I thought, by some high temp silicone for added insurance. It happened in cruise over some rough terrain. Find the cause before you fly it again is my recommendation.😉
 
More generally this means that the battery is not being charged by the alternator. I just went through this...12.x volts and negative amps.

I connected a multimeter to the alternator, started the engine, and saw 12.x volts. Replaced the alternator and got back to 14.x volts and positive amps.

Definitely get a multimeter and check everything. I had to make some long leads for the multimeter but it helped rule out a couple of wires.
 
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