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Mercruiser 5.7l not turning over

D

dorado1045

New member
Just finished changing exhaust manifolds and risers, new spark plugs and wires and new alternator. First attempt to start engine. turned over but would not start. While TS'ing that issue found corroded neutral ire (white) on the magneto. Then found a damaged in line fuse from the battery switch. after putting a jumper wire the fuse was, the engine no longer turns over. Have no idea why this happened, need help going on vacation in a week at the beach and need the boat . HELP
 
1) Marine engines do not have magnetos...
2) Fuses are rarely "damaged". They blow out because something down stream demanded excess current and they blow out to prevent further damage... or fires.

There are not normally inline fuses connected to battery switches. Where did the other end of this inline fuse go? How big, i.e., amp rating was it?
 
The fuse was a 32v 20 amp fuse , I did a resistance check and the line goes to the mercathode positive line . When I put the jumper across the fuse get 12 volts to the mercathode positive(red wire)
 
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