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Slow starter motor Mariner V6 175 hp

Sarrre

Contributing Member
Hello, I'm trying to start a Mariner 175 hp V6 engine which has not been used for a while. I think it is from late 80's. However when I try to start the engine, the starter motor turns very slowly. I have a fresh 100 Ah marine battery, but maybe it is too weak for the starter motor? What battery do I need to start this engine? Do you think it is related to the battery at all? Maybe it is another fault with the starter motor?
 
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