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Battery light. my local garage replaced main battery didn't…

Customer Question
Hi white battery light...

Hi white battery light . my local garage replaced main battery didn't cure it , replaced alternator didn't cure it i said all along its poss the aux battery im thinking im right ??

Mechanic's Assistant: Have you tested the battery? Have you tried testing the alternator?

Replaced both

Mechanic's Assistant: What is the model/year of your Mercedes?

2007 57 ml 320 cdi

Mechanic's Assistant: Are you fixing your 57 yourself? What have you tried so far?

No its been into a garage they diagnosed battery and alternator to my surprise as the car never drained

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

No thanks

Submitted: 6 months ago.Category: UK Car
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Answered in 2 hours by:
3/9/2018
UK Auto Mechanic: Kevin, UK Car Mechanic replied 6 months ago
Kevin
Kevin, UK Car Mechanic
Category: UK Car
Satisfied Customers: 3,220
Experience: Diagnostic technician at vw /audi specialist
Verified
Hi I’m Kevin it is very possible this is the auxiliary battery that is the cause here . Has car been scanned to see where the car believes fault lies . The warning light being on will have stored a fault code in the system giving where the car believes the failure lies
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