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Aviation Safety Officer for 20+ years. Maybe change wiring to have covered toggle switch for alternator and key for engine start/run. There would not be many scenarios where the need to disconnect the alternator from the power circuit.
The key used to crank, run and connect the alternator leaves too many opportunities for human error especially with an unlabeled switch.
Nice job getting ahead of the trolls. I run dual buss Shorai batteries and they have been trouble free on my 110. If they get run down to <11 volts, you want to use their charger to get full capacity back, not a traditional wet cell charger.
" At least one question remains: Why didn't the alternator keep the engine running?"
No. This was obvious, the alternator switch was set to off. When the batteries were depleted, the engine stopped. If the alternator switch was on, the engine would have continued to run.
Just found Jan's video. Mystery solved.
I applaud Jan's excellent video and analysis!
The video demonstrated that the plane's panel had a number of switches that were unlabeled or had what might have been labels at one time, but were now totally illegible. Not to be too critical, but I think that speaks volumes.
Agreed and thank you, in addition to the violation of operating procedures that rendered the entire dual battery system incapable of saving the day.