How to Jump Start a Car With Cables: Step-by-Step Guide

To jump start a car with cables, you generally connect red to the disabled car’s positive terminal, red to the assisting car’s positive terminal, black to the assisting car’s negative terminal, and the final black clamp to the disabled car’s designated ground point. Then follow the manufacturer’s starting procedure and remove the cables in reverse order.

Check both vehicles’ owner’s manuals first. Connection points, starting procedures, and restrictions vary. This guide covers a common procedure for compatible 12-volt vehicles; the manufacturer’s instructions take priority.

How to Jump Start a Car With Cables

Locate the positive terminals and approved ground connections before starting. Some vehicles use remote jump-start points instead of the battery terminals. Identify polarity by the + and − markings rather than color alone. Keep unattached clamps from touching each other or vehicle metal.

1. Red to the disabled car’s positive (+) connection. Attach one red clamp to the positive battery terminal or designated positive jump-start point specified in that vehicle’s manual.
2. Red to the assisting car’s positive (+) connection. Attach the other red clamp to the assisting vehicle’s approved positive connection.
3. Black to the assisting car’s negative (−) connection. Attach one black clamp to the negative terminal or connection specified by the assisting vehicle’s manual.
4. Black to the disabled car’s designated ground point. Make the final connection at the manufacturer-approved ground point, away from the battery and fuel system. Do not choose a random bolt, hood latch, or painted panel. If the manual permits an engine-ground connection, use the location it specifies.
5. Follow the manufacturer’s starting procedure. Start the assisting vehicle if instructed, then attempt to start the disabled car. Follow the specified waiting times, engine speeds, and cranking limits. Do not repeatedly crank the engine or use a universal RPM setting.
6. Disconnect according to the manual. For this common connection sequence, cables are removed in reverse order after the required running period. Keep clamps apart and clear of moving parts throughout removal.

Which Jumper Cable Comes Off First?

For the connection sequence above, remove the final black ground clamp first, then work backward:

1. Black clamp from the disabled car’s designated ground point.
2. Black clamp from the assisting car’s negative connection.
3. Red clamp from the assisting car’s positive connection.
4. Red clamp from the newly started car’s positive connection.

Follow any additional running-time or accessory instructions in the manuals before disconnecting. Do not let the clamps touch while any cable remains connected.

Jump-Starting BMW, Mercedes-Benz, Audi, and Other Modern Vehicles

Some vehicles have a battery in the trunk, under a seat, or behind a panel while providing dedicated jump-start connections elsewhere. Battery location alone does not tell you where to connect the cables.

Use the terminals and ground point specified for your exact model. Do not assume that every BMW, Mercedes-Benz, or Audi uses the same arrangement. Hybrid and electric vehicles also have specific procedures and restrictions for their low-voltage batteries. Never connect jumper cables to high-voltage components or orange high-voltage wiring.

What If the Car Will Not Start With Jumper Cables?

A failed jump does not automatically mean you need a new battery. Poor connections, inadequate cables, a deeply discharged battery, a starter problem, or another electrical fault can prevent starting.

• Stop immediately if cables become hot, smoke appears, or you notice an unusual smell. Move away from the vehicles and get assistance.
• Do not reposition clamps while the vehicles are running. Follow the shutdown and disconnection procedure before inspecting connections.
• Respect the manual’s cranking limits and waiting periods. Repeated attempts can damage components.
• If it still will not start, call roadside assistance or arrange a professional diagnosis.

What to Do After a Successful Jump Start

A successful jump gets the vehicle started; it does not establish that the battery or charging system is healthy. Driving may restore some charge, but a short trip—or a fixed 30-minute drive—does not guarantee a fully recharged battery.

• Follow the owner’s manual’s instructions after starting.
• Have the battery and charging system checked, particularly if the cause of the discharge is unclear or the problem returns.
• A deeply discharged battery may need a compatible external charger and further testing.
• If the charging-system warning light remains on, or the vehicle stalls or behaves abnormally, stop somewhere safe and seek assistance.

Frequently Asked Questions

Does red or black go on first when jumping a car?

In the common procedure described above, connect the red positive cable first. Confirm the full sequence in both vehicles’ manuals before making any connection.

Where does the last black jumper cable go?

It generally goes to the disabled vehicle’s designated ground point, away from the battery. Use the exact connection specified by the manufacturer.

Can I jump start a car in cold weather?

Cold weather alone does not rule out a jump, but a frozen or damaged battery must not be jump-started. If you suspect freezing or cannot assess the battery safely, call for assistance.

Can I use a hybrid or electric vehicle to jump another car?

Do not assume you can. Some manufacturers prohibit using these vehicles as donors. Check the exact model’s manual before connecting anything.

Will driving recharge the battery completely?

Not necessarily. The result depends on the battery’s condition, the depth of discharge, the charging system, and driving conditions. Testing and a compatible charger may be needed.

Can I follow these steps with a portable jump starter?

A portable jump starter has its own operating procedure. Follow both the jump starter’s instructions and the vehicle’s manual rather than applying the two-vehicle procedure automatically.

Manufacturer reference: 2022 Ford F-150 Owner’s Manual — Jump Starting the Vehicle. This is a model-specific example. Consult your own vehicle’s manual for the procedure that applies to your car.