I'm having some issues with my electrical system, and I'm curious if there is a troubleshooting guide I can follow. I'm looking for step by step, "clamp multimeter here, measure X." My battery dies after about 20-30 min in flight. My load is relatively low, 5-8amps (radio and transponder), seems to be either the generator, or voltage regulator that's the issue. Here's my setup: Engine: O-290-D Generator: Delco Remy 14V/20A Voltage Regulator: Unknown, photo attached Battery: Gill G-25 1) How do I measure the voltage/amp output of the generator individually? 2) How do I measure the voltage/amp output of the voltage regulator? 3) With nothing on, engine running, my amp meter goes negative with higher RPM, and goes more positive as I turn things on, is it wired incorrectly? 4) At 2000RPM the amp meter reads ~12.5A, this hints to me that it's either the voltage regulator or generator (should be 20A). 5) With nothing on, at 2000RPM, volt meter increases to just above 14V I've had a lot of people tell me to check this or that, but I don't know exactly where to connect leads and what the measurements should read. Yes I will be getting my A&P involved, but I would like to do my due diligence first. Thanks for the help.