M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

2004 ML350 Brake warning light on with ABS,BAS/ESP, 4-ETS

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Old 03-07-2015, 01:38 PM
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2003 ML55,2007 ML63
Joe, it seems your voltage regulator on the alternator is overcharging, hence all this codes.
Old 03-07-2015, 02:25 PM
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2004 ML350
Art, OK I will replace alternator and try again.

Thanks Joe,

What should be the max alt voltage at idle?
Old 03-07-2015, 02:48 PM
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NO!!! Not the alternator!!! It is the voltage regulator on the alternator that is a known culprit. At idle without load & without revving close to 13,8

Last edited by art_arev; 03-07-2015 at 02:57 PM.
Old 03-07-2015, 03:05 PM
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OK but I have a alternator shop that I will buy a remanufactured alternator that will have a new regulator.... Or should I just change the regulator? Is it easy to change?

Thanks joe
Old 03-07-2015, 03:40 PM
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Just the regulator. Its very easy when the alternator is out.
Old 03-07-2015, 04:18 PM
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It is a bosch alt
Old 03-07-2015, 04:28 PM
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Bosch part # of the regulator?
Old 03-07-2015, 06:37 PM
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Art,
I replaced the Alternator and the regulator now charging system is charging at 14.4 at idle. ABS lights are still on and will not reset. when I do go to reset it the red brake lights comes and first and then the 3 yellow lights come on ABS BAS/ESP & EST Do not know what to check next?? Thanks Joe.

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