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Matt
Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 20581
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a recurrent problem with my Mercedes ML 280 CD Sport.

Customer Question

i have a recurrent problem with my Mercedes ML 280 CD Sport. Whilst driving a red battery sign comes up and the steering wheel ceases. The mechanic has replaced the pulleys and the belt and it still keeps happening. what should I do please?
Submitted: 5 months ago.
Category: Mercedes
Expert:  Matt replied 5 months ago.

Hello

if the battery sign keeps popping up then its likely that the alternator isn't charging the battery

You can check that the alternator is actually charging the battery in the car by taking a battery voltage reading with the engine off then another with the engine running. The 2nd reading should be higher than the 1st and climbing steadily. And also check that the alternator is secure to the engine as this provides the ground for the charging circuit and make sure that the engine / gearbox earth strap is secure and the contacts are clean and bright.

if the alternator appears not to be working - take it to a electrical specialist and ask them to test it as sometimes you can replace just the diode pack and this will repair the alternator without requiring replacement

And one last thing is – how old is the battery? – As even good quality ones need replacing every 5 years and faulty battery just won’t hold a charge

Expert:  Matt replied 5 months ago.

Hi

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