It seems almost like an over voltage condition. Did the AMM checks on ohms for the PMG. 1.5 ohm from the GCU pins 5&6 [A] recpt. Also no short to grd. Starting the APU and watching the VM during spool up, the needle comes up normal as it should but keeps on going past 120v and almost the the top of the scale before it trips. So of course, never could bring on line. Anyone ever had this condition in their troubleshooting before?
