Purchased boat used this year 3/17. 2 nd x on water had been out motoring around the lake, slowed down for a few minutes, accelerated and engined died. Wouldn't restart. Would make a sound had to b towed in. Had the boat worked on. 1st x out exact thing happened right off the bat. Back into shop. Mechanic tried to get it to repeat the problem. Only thing they could figure was the tachometer was blowing a fuse. Replaced the fuse, gave us a supply of fuses. Worked fine for a while. Have used the boat maybe 5 x and now right back to the same thing. Took the boat out tonight. Started fine. Rode over to the pier to pickup up hubby. Slowed the boat down. Motor died & would restart. Not a sound. Went thru 7 fuses. Blew everyone. No response from the motor... Had unplugged the tachometer so we know it's not that blowing the fuse.... any ideas???