In case the headlights of car are used for a long duration of time without starting the engine, it can cause the battery to discharge. A battery may also get discharged if the ignition key left in “On” position for long period or if there is any abnormal parasitic drain. In case if your car does not start due to a discharged battery, you may require starting the car from an auxiliary power source.
Things you will need: Jumper cables and another car having a healthy battery
Confirming if the problem is with the battery: Before you try to jump start your car, make sure that the problem is indeed due to a discharged battery.
To confirm this, turn the ignition key “On” and check if the headlights are dim. Dim headlights indicate that the battery is discharged. Another test that you can do to confirm this is by cranking the engine. If the engine cranks too quickly, it indicates that the problem is not with the battery, if it cranks too slowly, it confirms that the battery is discharged.
1. Apart from confirming that the battery is discharged, you also need to ensure that the battery is not cracked and is in good condition. Connecting it another battery can cause it to explode.
2. Make sure that the car do not touch eachother while you are trying to jumpstart. Apply hand brakes before connecting the jumper cables.
3. The batteries (discharged and charged) should be of the same voltage.
4. The black alligator clip should not come in contact with a red alligator clip at any time while you are trying to jump start.
Steps to use for jump starting
1. Park the cars closely so that you can connect the jumper cables easily.
2. Open the engine hoods of both cars and ensure that the healthy battery of the car is of the same voltage as the battery to which you are about to connect it with.
3. Identify the positive and negative terminals of the batteries. Positive terminals will have ‘+’ sign and will have red cable connected to it and would most likely be covered, while the negative will be marked ‘-‘ and have black cable connected to it.
4. Keep the car keys removed from both cars and all electrical equipment like music system, cabin light etc. turned off.
5. At all times ensure that the red and black ends of the jumper cable do not touch each other while they are connected to the batteries, this can cause arcing and can cause serious damage.
6. Connect the jumper cables in the exact order as mentioned below.
a. Positive terminal of the battery that has low charge with one end of the red alligator clip.
b. The second end of the red alligator clip to the charged battery.
c. The negative terminal of the good battery to the one end of the black alligator clip.
d. Second end of the black alligator clip to a piece of metal on the car which has discharged battery.
7. Start the car that has charged battery and rev it around 1500 - 2000 rpm for about a minute and a half, this would charge the dead battery slightly. Subsequently, try to start the car with discharged battery. This should probably work and the car with discharged battery should start.
8. If the above mentioned steps do not work, have the car towed to a nearest garage.
9. Disconnect the jumper cables in the exact order mentioned below.
a. Grounded end of the black alligator clip from the car with discharged battery.
b. Other end of the black wire of the jumper cable connected with the negative terminal of the charged battery.
c. Red alligator clip of the jumper cable connected to the positive terminal of the charged battery.
d. Other end of the red jumper cable connected to the positive terminal of the discharged battery.
10. Keep the car’s engine running and drive it for at least 30 minutes. This should charge the battery sufficiently.