Set the throttle on fast idle. Take off the green wire field terminal connector off of the alt field male spade terminal & ground the alt spade terminal (not the wire you removed from it) for 3 seconds max & if this full fielding makes the alt max charge then all is good in the 'hood except for (1) the green wire from the alt to the reg "you checked it" (2) reg ain't grounded "I'm thinking it is" (3) reg is fried. I believe you said the alt/reg are both getting switched 12V on the blue wire. Have all bulbs/accessories OFF when full fielding & I like to run an 8 ga or larger jumper from the alt to the batt when doing this. A bit picky but that's me. Holler how it goes.