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casperboat

Why does it spark when connecting battery, with isolator off..

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Just connected up the battery and the lead sparked a little, i've seen it before when connecting up various things, but on the landy the 2 positive cables go straight to an isolator switch each, which was turned off, 1 in the cab, the other in the engine bay which used to be for a winch.. . Not sure how there could be a connection anywhere to make it spark.. It only sparks as the cable touches, once it's touched it's fine..

Regards.

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One of your supplies to the isolators has an earth fault on it or some times they have a fused supply linked across the isolator to feed small items like clock or radio.

If you leave the connection on it .will eventually drain your battery

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