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Greetings:
The alternator out light get's it's "power" from a differential between alternator and bus voltage. When the alternator voltage is lower than bus voltage the light will come on. There is not a true negative or ground in the circuit, it is the difference in voltage that forms the electrical circuit. Beginning with serial number 337-0756 there is a transistorized over/undervolt sensing unit. This unit has both a low volt light and a high volt light. From 337-526 through 755 the light is between the battery and field terminal of the OVR.
Landing lights should not take out both circuit breakers. Something else is going on. If you dig through the system you will see plenty of places for electrical gremlins to hang out. I rewired my charging system including the circuit breaker panel. I have much more confidence in the system now. I found a few poor connections that had clearly been causing problems for years.
I'll look for a picture of my new panel.
Dave
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