I have a Miprom late 80 to 90 that I replaced the 4ea p24107 dual bridge,scr firing board. Car was blowing 4f fuse 10a,that was month ago. Problem back today checked motor had 220k to ground blew out now I got ol. Car will run about 20minutes or so before fuse blows. New board came from Kone spare. Question is what causes this to happen so I can cure replacing boards so often if board is problem.
