![]() Motorists and service garages often have a portable battery charger operated from AC power. Many vehicles turn off the cigarette lighter outlets when the key is turned off, making the technique unusable unless the ignition key is turned to the 'accessory' or 'on' position, after which the cigarette lighter outlet and battery become electrically connected. This method works by slowly recharging the battery, not by providing the current needed for cranking, as the engine cranking motor current draw will greatly exceed the fuse rating in a cigarette lighter outlet. While this eliminates concerns with incorrect connections and generation of arcs near battery terminals, the amount of current available through such a connection is small. Cigarette lighter outlet Īn alternative to jumper cables is a cable used to interconnect the 12 volt power outlets ( cigarette lighter outlets) of two vehicles. There are various portable jump starters that are multi-functional and can be used to charge other electronic devices as well. Portable boosters may automatically sense the battery's polarity prior to sending power to the vehicle, eliminating the damage that can result from reversing the connection. Other methods Ī hand-portable battery, equipped with attached cables and charger, can be used similarly to another vehicle's battery.Ī self-contained jump box contains a battery and connects directly to the battery of the engine that needs a boost. A vehicle with a frozen battery should not be jump started, as the battery may explode. If the dead battery is physically damaged, has a low electrolyte level, is decayed or frozen, a jump start will not repair the battery. Connecting 6V and 12V systems together may cause damage. ![]() Jumper cables should not be used to interconnect between different voltage systems. Owner's manuals will show the preferred locations for connection of jumper cables for example, some vehicles have the battery mounted under a seat, or may have a jumper terminal in the engine compartment. The recommended sequence of connections is intended to reduce the chance of accidentally shorting the good battery or igniting hydrogen gas. Jump start procedures are usually found in the vehicle owner's manual. Operation of a lead-acid battery may, in case of overcharge, produce flammable hydrogen gas by electrolysis of water inside the battery. Alligator clips are generally marked by black (−) and red (+) to indicate the polarity. The alligator clips may be covered in insulation to prevent inadvertent shorting. Jumper cables, also known as booster cables or jump leads, are a pair of insulated wires of sufficient capacity with alligator clips at each end to interconnect the disabled equipment/vehicle with an auxiliary source, such as another vehicle or equipment with the same system voltage or to another battery. Ī jumper cable connected to the positive (red) terminal Safe procedures for connecting and disconnecting cables are given in the vehicle manual. Motorists may carry jumper cables and other equipment in case of accidental discharge of the vehicle battery (for example, by headlights, interior lights or ignition switch left on while the engine is not running). If the vehicle charging system is functional, leaving the engine running will restore the charge of the battery, although it is usually recommended to drive the vehicle for a few minutes after starting to speed up the recharging process. Once the vehicle has been started, its normal charging system will recharge, so the auxiliary source can be removed. The external supply of electricity recharges the disabled vehicle's battery and provides some of the power needed to crank the engine. A temporary connection is made to the battery of another vehicle, or to some other external power source. Crocodile clips, also called automotive clips, on a set of jumper cablesĪ jump start, also called a boost, is a procedure of starting a motor vehicle (most commonly cars or trucks) that has a discharged or depleted battery.
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