The Mercs aren't like the OMC's?
With no wire harness attached, the motor will crank up and run, just not shut off.
Connect the jumper battery to the starter solenoid and jump from the starter relay to the positive post.
You will have to choke the motor down in order to shut it off.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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