GENERAL 10 2.8 JUMP STARTING A jump start or boost is a term for a method of starting a vehicle which has a ‘dead’ (discharged) battery. A second battery (often in another vehicle) is temporarily connected to the dead battery, to provide the initial charge required to start the engine. Once the engine is running, it will recharge the dead battery, so the second battery can be detached. However, if the engine stops running too soon, the battery may not have built up enough charge to restart the engine, so a further jump start may be required. Most vehicles use a 12-volt battery which provides power to a starting motor for the engine. When the engine is running, electrical power from its alternator restores the charge to the battery in preparation for the next start. When a battery is discharged, such as by accidentally leaving the headlights switched on when parked, the vehicle’s engine will not "start/crank" when the ignition key is turned. !! WARNING Do not allow battery electrolyte to come in contact with eyes, skin, fabrics or painted surfaces. The fluid contains sulphuric acid which can cause injury and severe damage. Wear rubber gloves, to avoid risk of contacts. INSTRUCTIONS 1. Make sure that battery providing jump start has the same voltage as the battery in the vehicle (12V). The voltage and capacity are given in the battery. 2. Pull a vehicle with a charged battery next to the vehicle with the dead battery, situating the two batteries as close together as possible without allowing the two vehicles to touch. 3. Keep the engine with good battery off and all connection turned off. Similarly switch off all electrical accessories of the vehicle with dead battery. 4. The connection of –ve lead point should be kept as far as possible away from the discharged battery and close to the starter motor. 5. Attach a positive jumper cable clamp to the positive terminal (the one with the plus sign) of the charged battery. 6. Connect the other red-handled clamp to the positive terminal of the dead battery. 7. Attach the black/negative cable to the vehicle with the dead battery; clamp it somewhere where the current can ground out, such as a bolt or bracket on the engine. You can also attach it to any metal, unpainted part of the vehicle's frame. 8. Ground the other black/negative cable on the charging vehicle, as described in the previous step. NOTE Care should be taken as there is possibility of spark to be produced. 9. Attempt to start the vehicle that has the dead battery should be made at the intervals of one minute and should not last more than 15 sec. 10.After starting, allow both engines to idle for approximately 3 minutes with the leads still connected. 11.Once the dead vehicle is running, remove the clamps one at a time in reverse order. 12.Allow the jump-started vehicle to run for half an hour in order to charge the battery. It will charge whether driving or idling. !! WARNING Avoid connecting of negative terminal battery of the dead battery directly to the negative terminal of the good battery as there are chances of battery explosion. The voltage from a vehicle battery is dangerous whether the engine is running or not. Do not touch the metal ends of the jumper cables with your hands, nor touch them to each other. Never grasp both battery terminals at the same time. NOTE Always check your owner’s manual before jumpstarting a vehicle. Some new vehicles have special 'jump-start lugs' where jumper cables are attached rather than to the battery cables. These allow the potentially damaging surge of current to bypass the electrical system (and all those fancy, new onboard computers). If the dead vehicle won't respond, there might be a problem in another part of the ignition system. Consult a mechanic. ! CAUTION Sometimes starting or running the charged vehicle while jump-starting the dead one can release a power surge into the charging vehicle and blow a fuse, damage the alternator, or harm other areas of the electrical system.
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