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Old 08 October 2007, 11:03   #11
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,620
Originally Posted by Limey Linda View Post
Remove the old battery. If the plates are shorted internally then it will pull the voltage down. Try again with a known good battery, maybe the one from your car.
Note: Do NOT try to switch the cables back to the original battery once it starts (i.e. while the motor is running.) The alternator circuit does not like being run without a load, and you'll risk blowing the alternator's rectifier components.

Verify the battery is the problem, then replace if needed. Shut the motor down whenever disconnecting batteries.


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Old 08 October 2007, 11:37   #12
Andy Moore's Avatar
Country: UK - England
Town: Cowes, Isle of Wight
Boat name: Ditherer
Make: Avon Adventure 620
Length: 6m +
Engine: Optimax 135
MMSI: 235032203
Join Date: Sep 2005
Posts: 1,638

Thanks All, for the responses.

Update: after putting a battery charger on the battery overnight, the outboard fired up, first go.

Upshot: the Mercury is NOT HAPPY unless its battery is fully charged. We tried with jump leads and a booster pack, with no luck.

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