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Jump Starts: What You Need to Know

Admin • Feb 05, 2020


Man Checking on its Cars Battery — Dearborn, MI — Rusko’s Service Center
If your vehicle won't start, what should you do next? One common issue with autos that won't start is a dead battery. If a dead battery is the problem, jump-starting the car could get you back on the road quickly. Here is a basic guide to jump-starting an automobile.

Understanding Cables
To perform the jump start you will typically need a pair of jumper cables. One cable, which has a negative charge, is black, while the other cable, which carries a positive charge, is red. Each cable has an alligator clip on both ends. The clips are attached to the leads, or terminals, on both the dead battery and a good battery during the jump start procedure.

Understanding Donor Cars
When you have a dead battery on your hands and want to use a pair of jumper cables to start the car, you need a working battery to boost the bad battery. Generally, the working battery will come from the vehicle of a driver who volunteers to assist you. The other vehicle is called the donor car. The donor car might belong to anyone nearby who agrees to help or a friend or relative who comes to your location.

Establishing a Connection
The jump start process involves connecting the bad battery and the good battery of the donor car. You make the connection by attaching the alligator clips of the jumper cables to the positive and negative terminals on each battery. After the connection is made, starting the donor car often transfers enough power to the dead battery to start the stalled car.

A critical point regarding connecting the jumper cables to each battery is that the positive, or red, clip must go onto the positive terminal and the negative, or black, clip must go onto the negative terminal. Make certain that you do this correctly because attaching a clip to the wrong battery terminal can cause sparks, a short circuit, or even cause a battery to explode. 

To make sure that the connections are safe, look for a positive sign next to the positive terminal and a negative sign by the negative terminal.

Checking for a Match
Another key point to remember is that the voltages of the two batteries need to match. So, if the dead battery is 12 volts, then the battery of the donor vehicle should be 12 volts as well. Attempting to jump-start a car when the two batteries do not have the same voltage could damage one or both of the vehicles.

Ensuring Safety
Certain safety precautions are necessary when attempting a jump-start.

Place each car in park or neutral and apply the parking brake. Do not let the two vehicles touch each other. Ensure that the lights and turn signals are off in each car. Avoid leaning over either battery. Don't attempt a jump start if a battery is cracked or leaking fluid.

Also, drivers should check their owner's manual before any jump start. Some manuals may advise owners not to engage in jump-starts.

Following the Procedure
The first step in jump-starting a car is to attach a positive clip to the positive terminal of the bad battery. Then connect the other positive alligator clip to the positive terminal of the good battery.

Next, connect one negative alligator clip to the negative terminal of the good battery and the other negative clip to an unpainted metal part of the vehicle with the dead battery. Do not attach a negative clip to a dead battery, as this is a safety hazard. 

Finally, start the engine of the car with the good battery and allow it to idle for a few minutes. Then turn on the ignition in the other car and see it starts. 

Jump starting a car is a good way to get a car back on the road, but it's also a bit tricky and not everyone will want to try it. If you want to make certain the job is done right, let the professionals at Rusko's Service Center perform this task. We will be glad to come to your location and perform a jump start. Contact us for your roadside assistance needs.
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