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Old 11-07-2018, 02:13 AM   #1
Rfisher30's Avatar
Join Date: Mar 2016
Location: Kemah, TX
Posts: 6
Default Alternator Anomaly

Last week during the second post-annual shake down flight I had an “altenator” (yes spelled wrong) indication on the G3X and the Bus current dropped to zero. Voltage readings were normal during the flight (around 13.5 volts).

On the ground, voltage out of the alternator (when isolated) was 18V at idle and higher at higher rpm. Suspecting a failed rectifier/regulator, I replaced it. The “altenator” indication went away, but I still have 0 amps current displayed on the G3X.

Shunt fuses on ohmmeter checked good. Wiring & connection continuity checked okay.

What have I missed?

A/C Super Sport ELSA
TTSN 209 hrs
Engine 912 ULS
Avionics Full Garmin Suite (G3X & GEA24)
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Old 11-08-2018, 05:25 AM   #2
Join Date: Oct 2018
Location: STL
Posts: 8
Default Re: Alternator Anomaly

Any chance during the annual that a ground got moved off the shunt?
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Old 11-08-2018, 06:34 AM   #3
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Join Date: Nov 2013
Location: Nampa, Idaho
Posts: 654
Default Re: Alternator Anomaly

I had one of the little wires break that goes from the shunt to the GEA-24. This gave a 0 amps indication.
Phil Nelson
A&P-IA, Maintenance Instructor
KF 5, Continental IO-240
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