91 Mercury 15hp problems

by Jason

I bouaght a 1991 15hp Mercury outboard ran great first 15 times out then one day it would not start at all. After going over the motor I found a ground wire connection that was bad replaced the connection. Now the motor will start and run fine for about ten minutes then will not reatart. Thought maybe over heating replaced the thermostat no fix. Chased all grounds they where good. Replaced spark plugs and wires still same problem. Looking into replacing the power box but want to ask what others may thing before I spend that much for one part. Also carb has been rebuilt twice

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