Thanks for the info guys. I checked the grounds and they seem OK, I want to replace them with heavier gauge wire when I get the chance. When I pull the starter today I'll see if I can tell what started the zapping, hopefully I can get a rebuild kit and keep the nippodenso starter.

85 Pickup, Desert tan spray job, 3" Rough Country lift, Marlin shackles+bumper, Chebby igniter, 33x10.5" BFG's