with a jumper, jump 12V to the blue wire "ign" side of the reg & see if it straightens out & if so seperate/clean the bulkhead halves for a start on where the part time open is (might take some digging). If it dont straighten out with that then jump from the reg case to ground & see if that is it tho I dont think so with all the reg swapping that has taken place but it is an easy check. pull/check the alt brushes & it might be easy to swap in another alt from your stash. do check the green wire from reg to alt (& its terminals). If you get another reg FOR SURE get an electronic one. reportedly some parts store ones can take the OE electromechanical black cover for a stock appearance & Mrandy on here sells or used to sell one that is electronic with a stock black OE electromechanical cover. Your parts house has a Wells 706 (iirc) electronic (dont look stock tho if that is important). SWAG-bad reg or alt brush issue.