M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

2010 ML350 Alternator replacement

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Old 01-28-2019, 02:51 PM
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2010 ML350
2010 ML350 Alternator replacement

My 2010 ML needs a new alternator, but I'm not trying to pay dealer prices. From what I can see looking at the way its mounted...it looks like it is only held in place by 4 bolts, the power post on the rear, and the little wiring clip and connector. The bolts don't look like standard sockets though. Does anybody know what type and size attachments are used on these mounting bolts? Almost looks like a star? Also, if anyone can link to, or post a pdf of the steps involved as well as tools required I would really appreciate it. I bought the part for under $200 and I want to attempt the installation on my own. Thanks!
Old 01-28-2019, 03:07 PM
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They are male Torx bolts.
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File Type: pdf
R&I Alternator 272 & 3 Eng..pdf (101.0 KB, 531 views)

Last edited by Maj. Dundee; 01-28-2019 at 11:57 PM.
Old 01-28-2019, 03:17 PM
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Thanks for that, but I was looking for the steps involved in removing the alternator itself...not taking it apart. I'm looking for how to release the belt tension, and also what size torx socket I need to pick up to loosen the 4 mounting bolts. The pdf that you posted looks more like how to take it apart once it is removed.
Old 01-28-2019, 11:58 PM
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Sorry for the mistake. Go to my original post for the correct PDF.
Old 01-29-2019, 07:36 AM
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Thank you! Exactly what I was looking for. I'm going to start tackling this later this morning after the kids are off to school.
Old 08-20-2020, 08:32 PM
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Originally Posted by Maj. Dundee
Sorry for the mistake. Go to my original post for the correct PDF.

Maj Dundee, can you please post the installation isntructions for my 2008 ML320 CDI? Or its the same procedure?

PS still working on the horns 🙂. Thank you sir
Old 08-21-2020, 05:36 AM
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Originally Posted by Dinismb
Maj Dundee, can you please post the installation isntructions for my 2008 ML320 CDI? Or its the same procedure?

PS still working on the horns 🙂. Thank you sir
For the alternator?
Attached Files
File Type: pdf
R&I Alternator 642 Eng. #1.pdf (118.1 KB, 223 views)
File Type: pdf
R&I Alternator 642 Eng. #2.pdf (84.8 KB, 132 views)
File Type: pdf
R&I Alternator 642 Eng. #3.pdf (90.7 KB, 119 views)
Old 08-21-2020, 09:30 AM
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Originally Posted by Maj. Dundee
For the alternator?
Yes and thank you Maj Dundee.
Old 08-21-2020, 12:13 PM
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Are you having a problem with the horns? If so describe the problem.
Old 08-21-2020, 12:24 PM
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Originally Posted by Maj. Dundee
Are you having a problem with the horns? If so describe the problem.
yes youre already helping me with that. I have yet to troubleshoot the next steps you suggested. I was going to continue working on the horns this week but the alternator gave out.

https://mbworld.org/forums/m-class-w...ml#post8117342


I got the alternator out already and waiting for UPS deliver the new one. It was a pita.




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Old 08-21-2020, 12:33 PM
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Originally Posted by Dinismb
yes youre already helping me with that. I have yet to troubleshoot the next steps you suggested. I was going to continue working on the horns this week but the alternator gave out.

https://mbworld.org/forums/m-class-w...ml#post8117342


I got the alternator out already and waiting for UPS deliver the new one. It was a pita.


How did the alternator get the black coloration?
Old 08-21-2020, 12:41 PM
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Originally Posted by chassis
How did the alternator get the black coloration?
I dont know but the ML has 161k miles. On the GL died at about the same mileage 2 years ago.
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