Do you know how many watts your stator produces ?
Do you know how many watts you are using ?
Is you reg/rec working , properly no spikes etc etc
Have you checked for bad / loose ground contact points ,broken wires , this can produce a feed back signal and fry stators
Same with positive bad contact will cause things to over heat .
With two different stator frayed , I,d be looking at reg/rec , and ground contacts