Roadside & Safety guide
How to Jump-Start a Car Safely (Step by Step)
Written by the ASE-certified technicians at Auto Repair Shops America · 15+ years of hands-on repair experience
The short answer
Connect red to the dead battery's positive, red to the good battery's positive, black to the good battery's negative, and black to bare metal on the dead car. Start the good car, wait 2–3 minutes, then start the dead car and remove cables in reverse order.
Before you start
Park the cars close but not touching, turn both off, and check that the dead battery isn't cracked or leaking.
Connection order
Following the correct order prevents sparks near the battery, which can vent hydrogen gas.
After the jump
Drive 20–30 minutes to recharge, then have the battery and alternator tested.
Frequently Asked Questions
Can jump-starting damage my car?
Reversed cables can damage electronics — follow the order carefully.
Are portable jump starters safe?
Yes, modern lithium jump packs are safe and convenient.
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