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1986 Mariner/yamaha 2 stoke 55hp outboard help needed

putters

New member
Hi all

We recently bought a boat with the above engine which needed some work, we have refurbed the boat but are now having engine issues. One of which has us stumped, the engine is only putting 12.5 volts back into the battery so we are not keeping any charge in the battery.

The guy we bought the boat from said that he recalls a third cable that runs from somewhere on the outboard back to one of the terminals on the battery but his not sure where it came from or which termainal it went on.

Can any one help please​
 
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