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Old 08 January 2018, 17:58   #1
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Why would my engine drain my battery when off?

Yam 200HPDI, 2003.

Recently, had a dead battery after standing for a while. I replaced the battery, charged and connected and it drained again over a week.

On testing I see the engine is pulling 0.35amps from the battery even when the ignition is off.

When connecting the battery I hear the main solenoid click in the engine. As I say the engine ignition is off ... what's pulling this current.

It never used to do this but has started to.

Something must be grounding, maybe in the helm ..... any ideas?
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Old 09 January 2018, 06:07   #2
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Usual way to detect a parasitic battery drain is to connect a multimeter between the battery live terminal (usually +ve, but this is assuming you are -ve earth) and the live lead.
Then start pulling fuses - or disconnecting stuff - one thing at a time. When the voltage drops you've found or at least narrowed down the problem.
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Old 09 January 2018, 07:11   #3
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Speak to Davie on the forum, he may know what it is off the boat.
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Old 09 January 2018, 08:04   #4
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Take it there's a battery isolator fitted? You can check with multimeter at the engine for reading.

If that's working - then look at what else is connects direct to the battery that by-passes isolator.
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Old 09 January 2018, 09:58   #5
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Thought that was what main battery switches were for.
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Old 09 January 2018, 10:17   #6
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Main battery switches are not there to hide faults in other electronics. A good idea yes but a fault is a fault.
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Old 09 January 2018, 10:23   #7
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Might not be fault. Could be a the tank gauge, an electronic bilge pump, any number of instruments.
That said, I'd def also try to figure out what.
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Old 09 January 2018, 10:32   #8
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It never used to do it....it's a fault somewhere then?
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Old 09 January 2018, 10:53   #9
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faulty ignition switch if the solenoid is pulling in without turning on?
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Old 09 January 2018, 11:19   #10
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If you remove the feed from the ignition switch to the solenoid, as close as possible to the ignition switch, does the solenoid click out? This may involve cutting the wire as close as is reasonably possible to the ignition switch. If it does affect the solenoid, then it is the switch

Check for chafed wires in the wiring loom, especially where it goes around tight corners or through bulkheads. Does 'massaging' the wiring loom along its length have any effect on the solenoid. If so it is chafed wires within the loom.

If that does not get you anywhere, then leave the multimeter connected from the battery terminal, and disconnect everything, one wire/fuse at a time, then replacing it if there is no change to the current drawn. You will find the wire which is causing the problem when the current drawn drops to zero.

Do not attempt to start the engine with the multimeter connected. It will either blow the internal fuse in the multimeter, or destroy the multimeter. You just need patience and a bit of nouse.

Re:-It never used to do it...
The chap told the policeman when he crashed his car due to brake failure. 'They worked yesterday!'
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