How to Properly Jumpstart a Vehicle
A dead battery is one of the most common roadside problems. However, connecting jumper cables incorrectly can damage vehicles or create safety risks.
How to properly jumpstart a vehicle starts with understanding the correct cable order and safety precautions. Although jumpstarting is straightforward, mistakes can cause electrical damage or sparks.
Step 1: Position the Vehicles Safely
First, park the vehicles close enough for the cables to reach, but do not let them touch. Turn both vehicles off and engage the parking brakes.
Step 2: Identify Battery Terminals
Locate the positive (+) and negative (–) terminals on both batteries. Positive terminals usually have a red cover or marking.
Step 3: Connect Jumper Cables in the Correct Order
- Connect the red clamp to the dead battery’s positive terminal.
- Connect the other red clamp to the good battery’s positive terminal.
- Connect the black clamp to the good battery’s negative terminal.
- Connect the final black clamp to an unpainted metal surface on the dead vehicle (not the battery).
Step 4: Start the Working Vehicle
Start the vehicle with the good battery and let it run for several minutes. Then attempt to start the disabled vehicle.
Step 5: Remove Cables in Reverse Order
Once the vehicle starts, disconnect the cables in the exact reverse order. Keep clamps from touching each other during removal.
After the Vehicle Starts
Allow the engine to run for at least 20–30 minutes to help recharge the battery. However, if the vehicle struggles again later, the battery may be failing. In that case, schedule a car battery replacement.
When Not to Jumpstart
- Cracked or leaking battery case
- Visible corrosion or severe damage
- Strong sulfur (rotten egg) smell
- Hybrid or EV system concerns without proper guidance
Helpful Resources
For vehicle safety guidance, visit NHTSA or check Arizona road conditions at ADOT.