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Showing results for tags 'M20J charging system'.
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Hi all Yesterday on a flight from Avalon to Livermore I had a low voltage annunication towards the end of the flight. Never seen this happen before The ammeter was discharging at ~20A. The bus voltage was around 12.0V. I turned off a few loads but couldn't do too much to reduce the loads. The voltage held steady around 11.8V to 12V (was about 20 min from LVK) as I monitored the situation. It was VFR and plenty of places to land so no need to land immediately. A couple of weeks ago, I had to tighten the alternator belt (Kelly alternator, I am waiting for it to die, hopefully in benign conditions like this one). Here's the strange thing. About 4 miles from LVK, I put the gear down. The ammeter needle spikes down as expected, but gear comes down without issues and immediately thereafter the ammeter spikes positive like a bat out of hell. The low-voltage light goes out and the bus voltage jumps to 13.9V. The rest of the flight which lasted a few minutes, the charging system is functioning normally putting out about 15A or so. On the taxi, I am getting 10A charging. So, I believe the alternator is OK. Something intermittent perhaps in the charging system? Anyone else seen this behaviour? Thanks.
