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Matt
Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 21615
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a 2002 ML270 with a flat battery. The central locking

Customer Question

I have a 2002 ML270 with a flat battery. The central locking will not open, and the manual key will not open the drivers door, which is the only one with a manual lock barrel.
How do I get in to charge the battery?
Submitted: 2 years ago.
Category: Mercedes
Expert:  Matt replied 2 years ago.

Hello


A flat battery means you can't get the deadlock or alarm system to release its grip

I'd start by charging the battery as you can't get into the car/ boot the other way to do this is jack the car up so you can get under the front.

Locate the starter motor and the large power cable that runs to it - connect the positive battery charger lead to this terminal

then connect the charger negative lead to the metal of the engine block

This should complete the charging circuit and get some power into the battery allowing you into the car

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