Any experiance of fault detailed below?

Asked by duncanb 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

176,125

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

4 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~

3 people found this helpful.
4,615

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 people found this helpful.
16,045

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 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?

1 people found this helpful.
16,045

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

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!~

2 people found this helpful.
16,045

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

1 people found this helpful.

Your Answer:

C-Class

Looking for a Used C-Class in your area?

CarGurus has 1,348 nationwide C-Class listings starting at $3,500.

Postal Code:

CarGurus Experts

  • #1
    Lorne Grandison
    Reputation
    12,450
  • #2
    zabi
    Reputation
    5,600
  • #3
    PPC123
    Reputation
    5,150
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Mercedes-Benz E-Class
35 Great Deals out of 518 listings starting at $5,450
Used BMW 3 Series
72 Great Deals out of 1,176 listings starting at $2,500
Used Mercedes-Benz S-Class
19 Great Deals out of 197 listings starting at $6,500
Used BMW M3
9 Great Deals out of 85 listings starting at $14,995
Used Mercedes-Benz CLS
8 Great Deals out of 113 listings starting at $7,200
Used BMW 5 Series
20 Great Deals out of 298 listings starting at $5,299
Used Dodge Charger
46 Great Deals out of 856 listings starting at $5,995
Used Chevrolet Corvette
22 Great Deals out of 801 listings starting at $18,999
Used Ford Mustang
32 Great Deals out of 1,609 listings starting at $7,999

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. Content will be removed if CarGurus becomes aware that it violates our policies.