Have 1999 e70pl4ee Evinrude 70hp 4 stroke. Son had it running about 10 minutes when it started to give off white smoke. Shut it off and it wouldn’t crank, tilt, etc. 30 amp fuse is blown on top right of motor, 15 is ok. When I plugged a new fuse in it sparks a bit and will blow. OhmS to ground...