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Voltage Regulator Replacement DIY- Its usually not the alternator

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Voltage Regulator Replacement DIY- Its usually not the alternator

 
Old 03-10-2011, 05:14 PM
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Voltage Regulator Replacement DIY- Its usually not the alternator

Its bound to happen, you get the awesome message that convenience functions are disabled! Then hopefully it comes back and all is good. Well it happened to me back and fourth over a period of 2 days, so I knew the battery or alternator was on the way out. Battery tests showed normal, so it was alternator time.

From what I know, the mb alternators seem to be rock solid. Its the damn voltage regulator that goes out. I guess it makes sense, as it is a wear item.

First get one of these....


1 BOSCH_0031546506_S

BOSCH Voltage Regulator NOTE: For cars with BOSCH Alternator.

$41.00
aboveallmotorwerks.com





I was able to replace this in about 20 minutes without removing the alternator!



Jack the car up on one or both sides and remove the underbelly pan.

Disconnect the battery (just do it) and get under her and take a look!

Find the bottom of the alternator. Remove the black and yellow wire connector.

Also screw off the plastic black cap in the middle.



Using a Philip's head, remove the screws that hold the cover on.



you can then use a socket to remove the power lead from the middle.





Now, the voltage regulator is only held on with a few more Philip's screws. (3)

Remove those, and she will fall (literally) out



Take a look at the difference and you can see the wear on the leads of old vs new





Put the new one back in, using the same process. The smaller screw goes in the bottom corner of the regulator when you get it back on the alternator.

Replace what you took out and you should be good to go!

I have done a few of them for people and have yet to have to replace an alternator

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Old 03-10-2011, 05:38 PM
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nice DIY
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Old 03-10-2011, 09:00 PM
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Pretty cool that you can do this without removing the alternator.
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Old 03-10-2011, 09:03 PM
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31 bucks on parts.com for u cheap skates
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Old 03-10-2011, 09:04 PM
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Haters crazy
Nice writeup!
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Old 03-10-2011, 10:56 PM
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Jake can you do mine when you come down for the mile
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Old 03-11-2011, 08:44 AM
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Nice writeup, Thanks!! Will be doing this soon.
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Old 03-11-2011, 09:22 AM
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Originally Posted by shardul View Post
Jake can you do mine when you come down for the mile
not a problem!

we can even do it at the track. Just bring a socket set and a screwdriver!
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Old 03-11-2011, 09:23 AM
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Nice Write up.
Thanks
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Old 03-11-2011, 09:30 AM
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Originally Posted by loungn14 View Post
not a problem!

we can even do it at the track. Just bring a socket set and a screwdriver!
thank you Sir!
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Old 03-11-2011, 09:34 AM
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Great DIY write up Jake.
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Old 03-11-2011, 03:26 PM
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Great pics!

Did it matter that it looks like the tabs are different on the 2 regs?? I guess it was not an exact replacement.
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Old 03-11-2011, 04:13 PM
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Originally Posted by Will101 View Post
Great pics!

Did it matter that it looks like the tabs are different on the 2 regs?? I guess it was not an exact replacement.

i believe those are the leads that wear down and therefore do not make enough contact to be reliable. Thats where changing to a new one solve the problem. I could be wrong.

kind of like brush contacts on an electric motor.

Last edited by Hellzno; 03-11-2011 at 08:04 PM.
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Old 03-11-2011, 07:17 PM
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Originally Posted by Hellzno View Post
i believe those are the leads that wear down and therefore do not make enough contact to be reliable. Thats where changing to a new one solve the problem. I could be wrong.
correct! Once they get small enough, they don't make contact and you get the voltage errors!
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Old 03-11-2011, 08:49 PM
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Really useful infomation,,,,,,,,,,,,,,,,,,,,,,,,, many thanks
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Old 03-11-2011, 09:58 PM
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another nice DIY to save some $$$. Can we add this to the DIY or sticky it?
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Old 03-12-2011, 07:05 AM
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Anything we need to know when we reconnect the battery?
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Old 03-12-2011, 07:08 AM
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Good info!!
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Old 03-12-2011, 07:08 AM
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Originally Posted by skratch77 View Post
31 bucks on parts.com for u cheap skates
Do you have the part number?
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Old 03-12-2011, 10:56 AM
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Originally Posted by 06E55 View Post
Anything we need to know when we reconnect the battery?
not really....just have to reset windows/sunroof as usual

Originally Posted by 06E55 View Post
Do you have the part number?
twas at the top ! 0031546506

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Old 03-20-2011, 09:12 AM
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Did mine last night. Very easy to remove and install... Too bad it did solve my issue... Can anyone point me to the cheapest alternator?
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Old 04-20-2011, 12:02 PM
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First and foremost thanks for this posting. Because of this I was able to resolve a problem that was tormenting my head. Better than this is being greedy. By the way this is my first post I'm a NEWBY in this forum. KEEP IT UP GUYS!! Right ON
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Old 04-20-2011, 12:15 PM
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Originally Posted by fastjog01 View Post
First and foremost thanks for this posting. Because of this I was able to resolve a problem that was tormenting my head. Better than this is being greedy. By the way this is my first post I'm a NEWBY in this forum. KEEP IT UP GUYS!! Right ON
Well at least you used SEARCH and didn't torment us by asking a NEWBY question like "my ESP light came on what do I do now?"
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Old 04-20-2011, 12:45 PM
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Originally Posted by TopEndS62 View Post
Did mine last night. Very easy to remove and install... Too bad it did solve my issue... Can anyone point me to the cheapest alternator?
Did you test the battery under the hood? It can also be the cause.
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Old 04-22-2011, 06:20 PM
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Originally Posted by jayhawkblk View Post
Did you test the battery under the hood? It can also be the cause.
well i changed the alternator and charged up the battery... car started up fine. but after 30 minutes of running.. the battery/alternator display popped back up. so i did a next charge and checked it with a voltmeter, and the voltage did not jump after start.... it stayed at 12.XX volts and kept going down.
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