Hi All,
I have a 912 uls it's setup with a rectifier, a capacitor and an in dash alternator malfunction warning light.
Normally the alt warning light would come on when you turn the master on , then go out once engine started.
I noticed while hanger flying and resetting the clock ,and such, that when I turn on the master , I have no alt warning light ( engine not running , it should be on).
I pulled the bulb and socket, I have a good bulb and socket is getting 12.7 volts .the voltage seems not to be consistent or there all the time. anyways my light does not light up and I am suspecting my rectifier. I plan on doing an engine run up, with measuring voltage off battery before start and when its running.

Any experience, stories with a bad rectifier, the signs and symptoms of , would be appreciated. I also would very much like a wiring schematic of your similar setup if available. Thanks Kevin