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Flat Battery


freedom51
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Think in some cases once a battery has died it also pulls down the donor battery when you're trying to jump start the car. One way to prove this would be disconnecting one or both the terminals on the flat battery and connecting jump lead directly to the wiring connector.

Not sure if this would cause any problems for the electrical systems, and of course it wouldn't be ideal to try and reconnect the original battery if you were then able to get the car started.

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I wouldn't recommend connecting the donor car to the wiring terminals of the other car with the battery disconnected and try to reconnect the battery once started - if anything that will cause a spike and damage the ecu.

If the car is totally dead even with a booster or donor car, I would check the main fuses under the bonnet.

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