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Old 06 October 2007, 14:49   #1
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Country: UK - England
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Optimax 135, starting with a flat battery

Is there any inherent reason why an Optimax cannot be started with jump leads or a powerpack, or is it something we are doing wrong?
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Old 06 October 2007, 15:59   #2
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is it spinning but not firing
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Old 06 October 2007, 16:01   #3
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I'm hitting the road soon but if you have a problem after 1615 ring 07886920181 and ask the Nasty lady that answers if you can talk to me!

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Old 06 October 2007, 16:12   #4
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Country: UK - England
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Boat name: TiLT 2
Make: Avon Adventure 620
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Engine: Optimax 135
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Quote:
Originally Posted by Rogue Wave View Post
is it spinning but not firing
It did spin, albeit slowly, a couple of times. But its making a clicking noise mostly.

Sorry to be vague but I am crap at engines etc.
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Old 06 October 2007, 16:16   #5
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They are very power hungry to start & need to pull a lot of amps to start, I had to replace my batteries when I bought mine!
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Old 06 October 2007, 16:48   #6
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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.
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Old 06 October 2007, 18:19   #7
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They need the full 1000 CCA to open the injectors so the battery you are jumping from will need that plus good cables and connectors.
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Old 06 October 2007, 22:53   #8
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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.
Good point.

Even with a massive jumper battery you still won't get it to start if there is a short inside the main one. I know - almost melted my HD jumper leads as well.....
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Old 06 October 2007, 23:15   #9
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They need the full 1000 CCA to open the injectors so the battery you are jumping from will need that plus good cables and connectors.
800 CCA
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Old 06 October 2007, 23:27   #10
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Ok what I meant was 1000 MCA
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Old 08 October 2007, 17:03   #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, 17:37   #12
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Country: UK - England
Town: Cowes, Isle of Wight
Boat name: TiLT 2
Make: Avon Adventure 620
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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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