Reason? It’s possible the strain on the jumper car’s alternator could cause damage or excess wear. For the first attempt, do not try to start the car with the dead battery while the jumper car’s engine is running and the cables are still connected.
Disconnect the cables and attempt to start the car with the bad battery. Run the engine for about five minutes, then shut if off.
If the dome/interior light comes on in the car to be jumped, it’s a good sign the cables are connected correctly.ġ1) Start the engine of the car with the good battery and raise the engine rpm to a fast idle (about 1,500 rpm, if the car has a tachometer). The reason for connecting the negative cable to ground rather than to the negative terminal of the dead battery is to minimize the chances of a spark near the battery, where there may be potentially explosive gasses. An accessory bracket or large bolt usually works well. A “ground” is a metallic/unpainted part of the engine or frame/chassis. Next, connect the other end of the red/positive jumper cable clamp to the red/positive terminal of the good battery.ĩ) Second, connect one end of the jumper cable’s black/negative clamps to the negative terminal of the good battery.ġ0) Finally, connect the remaining black/negative jumper cable clamp to a “ground” on the car to be jump-started. Once again, you don’t want to risk a major problem over a relatively trivial inconvenience.ħ) Assuming the cables check out ok, have one person hold one end – making sure to keep the positive and negative clamps from touching.Ĩ) First, connect one red/positive clamp of the jumper cables to the red/positive terminal of the dead battery. If the cables are damaged, find a better set or call AAA. Check for damaged insulation/frayed wires before proceeding. These should be in good physical shape, with the positive and negative clamps on each end clearly marked (red for positive, black for negative). This will help assure a good connection and a successful jump.Ħ) Get your jumper cables. Better to risk a little inconvenience than a possible explosion/fire or severe damage to your car’s electrical system.ĥ) Use a rag or paper towel or whatever is handy to clean off the exposed surfaces of the terminals. If you have any doubt at all, do not connect jumper cables. Be 100 percent sure which terminal is positive and which terminal is negative before proceeding. As a further identification aid, the positive terminal usually has a red cable leading to it while the negative cable is usually black. Each terminal is usually marked with a stamped-in “+” or “-” sign, or a red plastic cap (positive) and black plastic cap (negative).
Attempting to jump-start a leaking battery could result in a catastrophic explosion resulting from sparks igniting volatile gasses escaping from the battery.Ĥ) Locate the positive (+) and negative (-) terminals on each battery. If you see either, forget about jumping and call a tow truck. The reason for this is to prevent current draw to accessories, which will make the car harder to start – and to protect accessories from possible power spikes through the system during the jump-starting process.ģ) Inspect both batteries for signs of physical damage, in particular, cracks in the case and/or leaking fluid. 2) Put both vehicles in Park, depress the parking brake, shut off the engine (jumper car), turn the ignition switch to “off” for both cars and disconnect any plug-in accessories such as cell phones, iPods or radar detectors.
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