AOG with electrical problem - help please!

[JamesC]

Don't forget to clean the connections going to the diode board and the voltage regulators as these tend to be exposed. Clean every blade connector you can find in the cct. esp. the ones at the battery and alternator switches. They may look clean but if you scrape them you will see they are likely coated with a thin layer of corrosion, especially if somebody combined copper and aluminum connectors (yielding galvanic corrosion). All these slight increases in resistance are enough to keep the alternators offline.