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Old 08 October 2007, 12:03   #11
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Quote:
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.

jky
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Old 08 October 2007, 12:37   #12
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Country: UK - England
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Boat name: TiLT 2
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Update

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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