In cold weather, a good quality booster cable with six-gauge (or less) wire is necessary to provide enough current to the disabled car to start the engine. Larger diameter wire is better. Please check the owner's manual for BOTH vehicles BEFORE attempting to jump-start. Follow the manufacturers' procedures because some good cars should not be running during a jump-start of a disabled one. However, starting the disabled car with the good car running can prevent having both cars disabled. AVOID the booster cable clamps touching each other or the POSITIVE clamp touching anything but the POSITIVE (+) post of the battery. Momentarily touching the block or frame can cause extensive, costly damage.

6.1. If BELOW 10o F (-12.2o C), insure that the electrolyte is NOT frozen in the dead battery. If frozen, check for a cracked case and thaw BEFORE proceeding. The electrolyte in a dead battery will freeze at approximately 13o F (-10.6o C).

6.2. Without the cars touching, turn off all unnecessary accessories and lights on BOTH cars, insure there is plenty of ventilation, and put on some protective eye ware.

6.3. Start the car with the good battery and let it run for at least two or three minutes at fast idle to recharge its battery and check the positive and negative terminal marking on both batteries BEFORE proceeding.
[Source: BCI]

6.4. Connect the POSITIVE booster cable clamp (usually RED) to the POSITIVE (+) terminal on the dead battery. Connect the POSITIVE clamp on the other end of the booster cable to the POSITIVE (+) terminal on the good battery.

6.5. Connect the NEGATIVE booster cable clamp (usually BLACK) to the NEGATIVE (-) terminal on the good battery and the NEGATIVE booster cable clamp on the other end to a clean, unpainted area on the engine block or frame on the disabled car and AWAY from the battery. This arrangement is to be used because some sparking will occur, and you want to keep sparks as far away from the battery as practical in order to prevent an explosion.

6.6. Let the good carcontinue to run at high idle for five minutes OR MORE to allow the dead battery to receive some recharge and to warm its electrolyte. If there is a bad jumper cable connection, do not wiggle the cable clamps connected to the battery terminals because sparks will occur and an explosion might occur. To check connections, first disconnect the clamp from the engine block, check the other connections, and then reconnect the engine block connection last.

6.7. Some car manufacturers recommend that you turn off the engine of the good car to protect its charging system prior to starting the disabled car. Check the owner's manual; otherwise, leave the engine running so you can avoid being stranded if the good car will not restart.

6.8. Start the disabled car and allow it to run at high idle. If the car does not start the first time, recheck the connections, and wait a few minutes. Now, try again.

6.9. Disconnect the booster cables in the REVERSE order, starting with the NEGATIVE clamp on the engine block or frame of the disabled car to minimize the possibility of an explosion.

6.10. As soon as possible, fully recharge, remove the surface charge and load test the dead battery for latent or permanent damage as a result of the deep discharge.

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