Hey guys, as the title states I had a sudden onset of a whine/RFI noise through my headset and a loss of adequate charging voltage today after taking off in my -8. It has an O-360A1A with a B&C L40 alternator. The whine changes tone with an increase in RPM. It also is very loud when I try to transmit over the radio.
It’s been great since I’ve owned it. I’m a little baffled by this sudden onset though. I checked my headset jacks and grounds, all look right and not touching the airframe. It just started at random in mid flight (about 30 seconds after takeoff).
I did narrow it down to the alternator circuit. When I kill the alternator, the whine goes away and battery voltage drops to about 12 volts. When I turn the alternator back on the voltage goes up to about 12.8 and then steadily drops back down.
Any ideas? I have searched the forum but have not turned up situations that match mine. Thanks for yalls help!
- Gabriel
It’s been great since I’ve owned it. I’m a little baffled by this sudden onset though. I checked my headset jacks and grounds, all look right and not touching the airframe. It just started at random in mid flight (about 30 seconds after takeoff).
I did narrow it down to the alternator circuit. When I kill the alternator, the whine goes away and battery voltage drops to about 12 volts. When I turn the alternator back on the voltage goes up to about 12.8 and then steadily drops back down.
Any ideas? I have searched the forum but have not turned up situations that match mine. Thanks for yalls help!
- Gabriel