i have a 4kw 8hp agtornics gen set that has no ac output . this unit has a rotor with four slip rings. two rings feed the ac plugs. and two appear to feed a bridge rectifier that provides dc to the fields. there is no voltage reg. i assume that the rpm controls max voltage. i have checked for opens and grounds and have found none. the rectifier checks ok. i can power the rec with 120v ac and it has a dc output. i have researched utube for similar problems and it seems that its a co common occcurance for the unit to lose residual magnetism and stop outputing. i have tried the spin the drill backwards technique with no results. any ideas? coleman bought ag in the eightys but their service has no tech info on this unit larryr