I am guessing that you mean you have one of the jumpstart devices that you plug into the lighter socket? If that is the case plug it into the lighter socket turn it on and try to start the vehicle. If that doesnt work or you think the unit itself is dead plug it into the lighter socket on a vehicle that has a fully charged battery to charge it. If you post the manufacturer, model and name of your charger we may be able to find a manual for it than i can answer your question better
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