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Old 11-03-2021, 07:44 PM
dbhill916's Avatar
dbhill916 dbhill916 is offline
Join Date: May 2013
Location: Westerville, OH
Posts: 171
Default regulator failure mode?

hi all,

I had a great and otherwise uneventful flight the other day. On taxiing back to the hangar I had a complete loss of charging current. RPM's were > 2000, Amps ~ -12 A and voltage dropped to ~ 11.5 V. I shed some load and got the voltage up above 12 but current was still very negative. I ran up to around 3000 RPM and suddenly got good voltage and positive amps.

Is this a sign of impending regulator failure? Given their nature, I have already ordered a replacement. Should I install the replacement upon receipt, or put it into my spare parts kit?

Thanks in advance,
David B. Hill
RV-12 #0760
Dues paid through 6-2022
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Old 11-03-2021, 08:01 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,566

Ducati VR?
Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 750

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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Old 11-03-2021, 10:38 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,165

Possibly just a bad connection at the VR plug.
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Old 11-04-2021, 09:48 AM
Tony_T's Avatar
Tony_T Tony_T is offline
Join Date: Dec 2008
Location: Lacey, WA
Posts: 1,433

If you haven't already done so, consider removing the regulator wires from the black connector and installing them individually on the VR pins. There can be loose connections with the black plug and you can't easily feel that. Installing the wires without the black connector lets you feel how tight the connection is and also they go fully onto the pins which is not the case using the black connector.

Consider adding a dedicated ground wire from the VR mounting screw to the battery negative.

If you have the VR under the panel, consider nut plates and stand-offs to make changing the VR quick and easy.
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