My $30 4000 watt 3600 RPM generator give up this weekend. It has been running very hot even when unloaded.
Diodes and brushes are good, flashed it a few times no go.
With the rectifier out and powering the field direct from a 12 volt battery while spinning results in an odd buzz or humming noise.
I think it may be the exciter coil is shorted. Going to take it apart tonight and have a look if it looks like that may be the problem I may cut it out and power the field separately and see what happens.
Dammed hot today and would really like to run the AC a bit tonight.
Also need to get an ST head ordered. Anyone know of any 3 phase heads available other then the 25 KW listed at Rocky Mountain?