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Chris(aka-Moose)
Chris(aka-Moose), VW Technician
Category: VW
Satisfied Customers: 44511
Experience:  16 years of experience
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Battery light coming on after 30 seconds. battery and

Customer Question

hi,battery light coming on after 30 seconds. battery and alternator is new. 2012 vw passat 2,5
Submitted: 26 days ago.
Category: VW
Expert:  Chris(aka-Moose) replied 26 days ago.

Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.

With the engine running, battery light on, what is the voltage at the battery posts?

Chris

Customer: replied 26 days ago.
hi, 12,4-12,0
Customer: replied 26 days ago.
12,4-12,0
Customer: replied 26 days ago.
Battery new alternator new
Customer: replied 26 days ago.
sorry i don t needs yours servis, thanks
Expert:  Chris(aka-Moose) replied 26 days ago.

Thanks,

Those readings indicate your alternator is not charging.

Confirm the black wire to the alternator is showing battery voltage.

If that is okay then a scan tool is needed to check for codes in the vehicle electrical systems control module and engine control module. These 2 modules control the charging output of the alternator. Can you do these things.

What now

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Thanks for using Just Answer, and rating me so I am compensated, Chris

Customer: replied 26 days ago.
no codes in ecm