Have Boat Questions? Ask a Boat Repair Expert.
Hello my name is ***** ***** am I speaking with?
How man batteries are currently hooked up to the engine?
Is there any kind of battery switch, charging relay, or isolator installed into the boat, or are they just 2 batteries wired in parallel?
The battery switch needs to be tested for voltage drop, as well as the battery cables, if there is to much voltage drop across the switch or cables that will cause the alternator to over charge. What your mechanic needs to do is perform a voltage drop test between the battery and alternator. Voltage drop is caused by resistance in an electrical circuit that is not supposed to be there. This resistance turns into heat (like a light bulb) and makes the alternator work that much more harder to try and charge the battery. It will do it for a while, but it will eventually burn up.
The batteries themselves should also be inspected for a dead cell. If there is a dead cell in either battery that will cause the alternator to overcharge and then burn up as well.
Does that make sense to you?
The mechanic did replace the harness between the alternator and the batteries. What would cause the alternator to burn out along with the 100 amp fuse just as I turned the key to start it?
If the harness was installed correctly then no, it wouldn't cause it.
Was there anything else?
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I understand. Did you read my reply about voltage drop testing all of the cables and switches, as well as checking the batteries for dead cell?
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