I think it boils down to a "cracked fuse". This is where the fuse link attaches to the spade inside the dark color of the fuse. Very hard to see, and gives you a sence of "Oh Shi+". This happens on my EFI Husky. Checked all the fuses and the looked good, should have just replaced them in the feild. Was hauled back to camp 16 miles by one of those Orange POS, and looked like a dummy. Put new fuses in it just for the hell of it, and fired right up. Never had an issue since.