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Been having issues with my car recently replaced the fuel pump because it died out on me. Fuse 23 was blown. The car drove fine back to my house. Died out on me the next day with the fuse blown again. Pretty sure it has to do with either my e85 kit or the voltage regulator. I charged the battery up and got it tested which tested good. I drove the car to work with me reading the voltages both ways. Way to work was normal reading around 13.8-14.5. the way home was a different story. Picture posted of the voltage readings of the whole five mile trip home. After getting home I turn the car off and back on and it's back up to 14.4. is the voltage on regulator on its way out? I tried replacing it but one bolt got stripped and waiting for tools to get here to remove it.
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Could be. I’m having similar issues but my electrical system is far from standard. Replaced my voltage regulator and no fix. Probably alternator in my case.
How many miles? I changed mine at 36k miles and it was about 1/3 worn. They should last close to 100k miles I’d guess.
Not bad to get out and cheap to replace, might as well try. The bolts holding it in are easy to crossthread because you’ll be reaching up there blind, so be careful.
Could be. I’m having similar issues but my electrical system is far from standard. Replaced my voltage regulator and no fix. Probably alternator in my case.
How many miles? I changed mine at 36k miles and it was about 1/3 worn. They should last close to 100k miles I’d guess.
Not bad to get out and cheap to replace, might as well try. The bolts holding it in are easy to crossthread because you’ll be reaching up there blind, so be careful.
I tried tackling this job last week. The last bolt ended up getting stripped. Very tight space to work without pull down the steering rack. I'm currently sitting at 86k the connection plug that plugs in is very hard to remove any ideas on how to take this off?
Took me 30 mins before. I had to buy left handed drill bit and a right angle drill to remove the last screw which i will tackle today.
The last two days driving to work the car stop charging it would show 14 volts at start up and then go straight back down to 12.5. So i've been charging the battery. I will report back when i replace the voltage regulator. If this doesn't fix it then a new alternator
Yeah one on there when i was searching. What's the best way to remove the alternator drop steering rack remove through bottom? Or remove fan shroud?
I removed the fan shroud and pulled it from there, just be careful when removing it to not damage the radiator fins. I didn't have to drop the steering rack at all.
Wasn't too bad I couldn't get the last bolt out so I had to remove it. I also noticed under the car coolant leaking. I squeezed two of the big hoses could hear hissing coming from the thermostat housing. The black connector that comes off the housing cracked. At this point since I have everything out. Wondering if I should just buy a brand new Bosch alternator and pass on just doing the regulator.
Replaced voltage regulator also replaced thermostat plastic piece cracked and was leaking fluid. Car charges fine when cold 14.3-5 went for a drive went back down to 12.3-5. Came back parked the car pissed. Can't figure this out last ditch effort is to replace the alternator. if that doesn't work taking it to Mercedes.
Have you scanned for codes? Thought that would be the first thing one does to get an indication what could be wrong
Currently has no DTC codes or check engine lights. I did notice on the alternator test. The mechanical fault in the alternator would say yes then no and just keep going back and forth. I ordered a Bosch alternator going to replace it. Kinda stumped on this one
Incredibly strange interested to find out what it is
hi
Was the issue ever resolved. I’m having similar charging issues which I think is impacting the outside ambient temp sensor. Check engine light is on. Sensor has been replace , cabling has been checked including SAM connections.
error code - The outside temperature sensor has a short circuit to positive
i just replaced my voltage regulator after 164k...one day, started my engine and voltage never went above 11 volts.
replaced it and voltage is as strong as ever. as everyone stated, grounds may be corroded and causing a bad ground. or missing ground entirely. the alternator can be functionally tested at autozone as they have an alternator testing machine. generally speaking though, the alternators that mercedes use are stout and essentially are lifetime parts, but nothing is truly lifetime. granted the voltage regulator is the wear item. if you have a corroded ground, you may have excess amperage or other issue causing issue.
i just replaced my voltage regulator after 164k...one day, started my engine and voltage never went above 11 volts.
replaced it and voltage is as strong as ever. as everyone stated, grounds may be corroded and causing a bad ground. or missing ground entirely. the alternator can be functionally tested at autozone as they have an alternator testing machine. generally speaking though, the alternators that mercedes use are stout and essentially are lifetime parts, but nothing is truly lifetime. granted the voltage regulator is the wear item. if you have a corroded ground, you may have excess amperage or other issue causing issue.
Any tips on removing the plug to the VR would be appreciated..it appears to have a lock tab to it that it preventing its release
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