Any experiance of fault detailed below?

Asked by Apr 19, 2013 at 10:47 AM about the 2005 Mercedes-Benz C-Class

Question type: Maintenance & Repair

The battery/Alternator warning light appears intermittantly despite the battery being new and a volt meter reding shows alterntor is charging.Model is c200 cdi

9 Answers

100,675

It could be the alternator is failing or there is a loose wire somewhere. Plug in a cigarette lighter voltage gauge to check it. -- http://www.ebay.com/itm/12V-24V-Digital-LED-Auto-Car-TRUCK- SYSTEM-Lighter-Voltmeter-Gauge-Voltage-Meter-/190819892334? pt=Motors_Car_Truck_Parts_Accessories&hash=item2c6dc07c6e&vx p=mtr

3 of 3 people found this helpful.

ground wire off the battery to the chassis has been comprimized through corrosion, take the black wire off polish it clean, need to pull 300 CCA's through there, also the connection to the motor block and chassis. Be sure they've got what's comin' to 'em~

2 of 2 people found this helpful.
2,315

the charging circut is controlled from the ecu on the merc as it shares the same principle as the chrysler ecus and the fault itself is where the chip for the circut is breaking down had one similar put a rectifyer circut in line and bypassed the ecu to charge the battery and pulled the bulb behind the dash

2 of 2 people found this helpful.
9,145

Just got my 2007 MB out of the shop yesterday. Similar problem. It took several days of testing to find problem. All test of battery and alternator were good. The shop manager decided to let the car run in idle for well over an hour - then they discovered that the regulator started to steadily reduce its output to the point where it was no longer charging the battery. Replaced the regulator and now life is good.

4 of 4 people found this helpful.

a 2007 Still has a voltage regulator? thought they stopped using them altogether 'round 1980, what do I know? I know that you can get a one wire alternator with regulator built-in and throw the regulator that you've got into the bin, and don't worry the one-wire job has it down~ wondering now if there is a one-wire alternator replacement to fit your buggy?

9,145

The repair ticket from MB says Voltage Regulator in Alternator. The part was $163.40 plus labor.

they should at least give you the old one if they're rookin' ya' like that~

bobkat, am giving this guru business up, I've got an oil painting career to spend time on...it's been nice offering my help to you, one last thing on the one-wire alternator, apparently MBZ has two wire jobs- http://www.benzworld.org/forums/unimog/1505478-one-wire-alternator- conversion.html so long bobkat.....always a fan!~

1 of 1 people found this helpful.
9,145

Judge Roy - its always great to hear from you. Have a good day.

Your Answer

C-Class

Looking for a Used C-Class in your area?

CarGurus has 25,787 nationwide C-Class listings starting at $1,995.

ZIP:

Mercedes-Benz C-Class Experts

  • #1
    Lorne Grandison
    Reputation
    5,040
  • #2
    PPC123
    Reputation
    3,630
  • #3
    zabi
    Reputation
    2,590
View All

Related Models For Sale

Used Mercedes-Benz E-Class
470 Great Deals out of 19,796 listings starting at $1,400
Used BMW 3 Series
1,136 Great Deals out of 33,037 listings starting at $1,000
Used Mercedes-Benz S-Class
196 Great Deals out of 5,736 listings starting at $2,000
Used Mercedes-Benz CLS-Class
87 Great Deals out of 1,917 listings starting at $6,900
Used BMW 5 Series
453 Great Deals out of 16,324 listings starting at $1,995
Used Audi A4
280 Great Deals out of 11,295 listings starting at $1,999
Used BMW M3
46 Great Deals out of 1,758 listings starting at $5,995
Used Ford Mustang
712 Great Deals out of 38,301 listings starting at $895
Used Mercedes-Benz CL-Class
25 Great Deals out of 499 listings starting at $2,995
Used Honda Accord
1,098 Great Deals out of 61,486 listings starting at $999
Used Mercedes-Benz M-Class
277 Great Deals out of 5,987 listings starting at $2,296
Used Dodge Charger
443 Great Deals out of 27,662 listings starting at $1,989
Used Mercedes-Benz G-Class
17 Great Deals out of 1,145 listings starting at $21,995

Used Cars For Sale

2017 Mercedes-Benz C-Class For Sale
154 Great Deals out of 6,848 listings starting at $29,289
2016 Mercedes-Benz C-Class For Sale
32 Great Deals out of 1,388 listings starting at $21,888
2015 Mercedes-Benz C-Class For Sale
125 Great Deals out of 2,614 listings starting at $18,977
2014 Mercedes-Benz C-Class For Sale
63 Great Deals out of 1,707 listings starting at $13,977
2013 Mercedes-Benz C-Class For Sale
38 Great Deals out of 1,326 listings starting at $11,991

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.