Jump Start Mercedes-Benz GLK with Dead Battery

Can’t start your Mercedes-Benz GLK because of a dead battery? Learn how to fix the problem by jump-starting your Mercedes-Benz battery. This guide provides a step-by-step procedure for jump-starting a Mercedes-Benz GLK-Class with a dead battery.

Do not connect the jump box or jumper cables directly to the battery.

How to Jump Start Mercedes-Benz GLK with Dead Battery

What you will need

• 12V Jump Starter
  or
• Jumper Cables: Requires a running car

Procedure

1. Remove the metal key from your Mercedes-Benz key fob and use the metal key to unlock the driver’s door manually.
2. Open the hood. Pull the hood release under the dashboard.Go to the front of the vehicle. Then unlock the hood latch and pull up the hood. 
3. Locate the battery’s terminals on the engine bay’s passenger side. Notice a RED plastic cover with the + symbol on top of the positive terminal.
4. Slide the red plastic cover and connect the red (positive) jumper cable to the positive terminal.
5. Connect the other red clamp to the positive terminal of the good battery or jump pack. The ground point shown here is where the black (negative) clamp goes last, in the next step.
6. Connect the black clamp to the negative terminal of the good battery or jump pack, then connect the last black clamp to the ground point or bare metal on the GLK, away from the battery.
7. Get inside the car and turn on the ignition, not the engine. This will allow modules to power up. Wait 10 seconds, then try to start the engine.

Safe Jumper Cable Order

1. Red clamp on the dead battery positive (+).
2. Other red clamp on the good battery positive (+).
3. Black clamp on the good battery negative (-).
4. Last black clamp on bare, unpainted metal on the dead car, away from the battery.
5. Start the good car, wait a few minutes, then start the dead car. Remove the clamps in the reverse order.

Making the last connection on bare metal away from the battery keeps any spark away from battery gases.

Car Won’t Jump Start

If all you hear is a click, check that the jump starter clamps are making good contact. Ensure the jump box is fully charged. The car’s battery may be completely discharged. Keep the jumper cables connected for at least 15 minutes, then try again.

Why Did My Mercedes Battery Die?

• Age: most batteries last about four to six years. A battery near that age that needed a jump should be load tested.
• Short trips: modern cars draw power from many modules, and short drives may not recharge the battery fully.
• Parasitic drain: a module or light that stays on after the car is locked can flatten a good battery in a few days.
• Charging problem: with the engine running, voltage should be roughly 13.5 to 14.8 V. Lower than that points to the alternator.

Warning Lights After a Jump Start?

A low voltage event often leaves stored codes and warning lights in several modules. Drive the car for a while; many clear on their own. If they stay on, a scan tool such as the YOUCANIC UCAN-II Pro can read and clear the low voltage codes and show live charging voltage on supported models.

Frequently Asked Questions

Where do I connect jumper cables on a Mercedes GLK?

Use the red covered positive jump terminal and a ground point or bare metal in the engine bay. Connect the last black clamp to ground, away from the battery.

Why will my GLK not start after a jump?

If you only hear a click, the battery may be too flat or the connections poor. Let the donor car run for several minutes, check the clamps, and test the battery and starter.

Can jump starting damage my Mercedes?

Not if you connect the cables in the right order and avoid touching the clamps together. Using a quality jump pack reduces the risk of voltage spikes.

Check these troubleshooting and repair guides for more help on your Mercedes-Benz.

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