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post #2 of (permalink) Old 8th September 2006
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It sounds like the booster pack is feeding 12v back into the cigarette lighter socket when the engine is turned off. This is probably confusing a few of the car's systems, which will think that the ignition is still on (by sensing +12v on the 'ignition live' circuit.)

To fix it, you'd probably have to modify the circuit to either include a blocking diode (which will affect charging efficiency somewhat) or a relay.
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