Beast55

As far as I can tell the Alt pulley spins freely,,and it's not like a rubbery burnt belt smell, it's much more like an electrical smell, sort of....it's weird....

Celicasaur

FML I changed this part in the middle of December and now it looks like it may be dead already. I wish I used a Bosch part...

Randomly today the red battery message comes on, but this time my heater fan doesn't work, I'm told on the screen that I should turn my comand unit off, the convenience message is on....i drove it for about an hour trying to charge the battery but then the problem got worse. The voltage must have dropped a good amount and not been charging because I was getting messages about brakes being defective, stop vehicle etc and it was beeping at me.

My voltmeter is dead so I need to buy one. My guess is that the non-Bosch regulator has failed already or something. Gonna order a Bosch part now and hopefully that'll get it charging again! (last thing in the entire loop would be the main BCM, but i'm hoping it's not because my Celica needs a wideband as well )

Celicasaur

Some numbers.

So I checked the voltage this morning with the car off - 11.7 (not great, I know - probably wasn't charged at all last night for the duration of my driving)
With the key on one turn: 11.5
With the key on two turns: 11.4
With the engine on 10.9

After about 10 seconds it started beeping at me franticly with messages of brakes being defective and also that there was a battery/alternator problem.

I've now removed the non-oe voltage regulator and will be calling my local MB dealer tomorrow to order an oe part, just to rule that portion out of the equation.

uberwag

Great write-up on this. Did this today and went like a charm. I wasn't having any of the battery messages, but was getting dimming lights, rough idle, and O2 sensor lean codes. Changed out the voltage regulator with OE Bosch part, drove it around and smoother idle, no dimming, and no check engine lights.

Later tonight, started it up and backed out of the driveway and got the battery message, convenience features off. Turned the car off, turned it back on, and convenience features restored. Had dinner, came back out and had convenience features off/battery warning.

Thoughts? First guess is that I missed something during install, so I'll check that out tomorrow, but other thoughts?

crazy00c230k

Wanted to say thank you for this great write up. Did this on my 04 E320 earlier this week. No more pulsing lights, rough idle, and annoying "battery protection" messages.

SvtAmg

All of you guys are ordering this part online it seems. Is there a place I could get the voltage regulator locally so I can do it this weekend?

crazy00c230k

http://www.rmeuropean.com/search.asp...ord=0031546506

I got it there, overnight shipping was only $4 more expensive than regular ground shipping (to my house at least).

FASN8N

The other link did not work, try this
http://www.rmeuropean.com/Part-Numbe..._94E6B777.aspx

DVC

Thank you!

theliving50

I need to replace the voltage regulator on my 06 Mercedes e350. I tried to use this diy but it seems like on my vehicle there is much less room around the regulator. Has anyone completed this repair on a non AMG w211? My car has the same BOSCH alternator however it is jammed up close to the power steering arms and will make it tough to get a phillips or ratchet behind the alternator so that I can remove the regulator.

Any and all help is appreciated. Thank you.

E55AMG05

Although this was 6 moths ago if u are reading this I simply removed the whole alternator put in the new regulator brought it to auto advanced store for a FREE DIAGNOSTIC and it failed but that's the sure est way of doing this

typhoon43

Since this was bumped, and I happen to have pulsing interior lights now, do you also need to disconnect the accessory battery up front before doing this?

E55AMG05

no I didn't need to do anything with the accessory battery. I didn't bother and nothing happened, since you do have those mods and just for the process guarantee take the extra 5 min to remove the NEGATIVE CABLE on the accessory battery as well

Inspiredbenz

iTrader: (1)

Here are the symptoms of bad voltage reg.

-inteior /exterior lights flickering
- heated seats privelage disabled
- 6 cd changer not working/not reading cds etc..
- poor engine performance / rough idling

After changing voltage reg. Everything is back to normal

Gadget

I think my regulator just failed. Last time I drove the car I pulled in the garage and the headlights were flickering a bit. I got the low voltage, convenience disabled warning on the way home tonight. So, looks like time to swap out the regulator.

Wondering; how are you getting the battery voltage to display? I cannot figure that out.

G

Inspiredbenz

iTrader: (1)

^ yup exactly what happened here

get it changed and to chk voltage link below

Inspiredbenz

iTrader: (1)

^ yup exactly what happened here

get it changed and to chk voltage link below

Gadget

Thanks!!

11 volts with engine running or not running. Its broke....

G

Inspiredbenz

iTrader: (1)

Ya i think thats bad you should be in the 14 volts. range

Good news is that its not a expensive thing to replace lol

Inspiredbenz

iTrader: (1)

Ya i think thats bad you should be in the 14 volts. range

Good news is that its not a expensive thing to replace lol

VICK3358

Hello folks!
This is my first post here, so bear with me


I got my first MB back in Sept 2013. A CLS 55 AMG ;o)
About three weeks ago I have the red light warning message and turn out to be the alt because it was not charging (less than 12v). I replaced with a rebuild one from Autozone, but it died again three days after installed ;o(. I got it replaced under the warranty. Put in the new one and voltage is good (14+V).
However, driving the in the high way, it started rough idling and went off. NO red warning or nothing. Check the voltage and is around 13.80-14v. I turn on the engine again, and it started but again died after a few miles. I accelerate and can go only to 3K revolutions and start dying???
So my options are:
1. Replace the voltage reg
2. Replace the Aux Batt relay
3. Last, take it to a MB
FYI I have the flickering lights and when the alt died the first time I smell like a rare smell on the right side close to the alt. Can it be the ballast on the HID's.??
Any input on this endeavor will be greatly appreciated.

shardul

iTrader: (1)

Seems like the crank position sensor is going bad

VICK3358

Thanks! I'll look into that too. I guest the scanner will throw a code, right?

VICK3358

Sorry for the dump ?, Can someone direct me to where is the OBD II slot in this car??

shardul

iTrader: (1)

by the hood release under the dash