How difficult is it to replace an alternator and what's the most important thing/things to remember while doing so

Asked by Dec 22, 2014 at 08:23 AM about the 2004 Mercedes-Benz C-Class C 230 Kompressor Supercharged Sedan

Question type: Maintenance & Repair

Battery dying, re-charges great but
lasts nearly 3days before dies out
again. (Alternator right)??

5 Answers

5,435

Not always. You might have a large parasitic drain on your battery when the car is not in use. Secondly you can test your alternator with a multimeter simply by first, making sure your battery is charged, then starting your engine and putting the meter on the battery terminals. If the battery is reading around 14 volts or higher, it's taking the charge from the alternator. Alternators are basically two or three bolts and an electrical plug in the back of it.

25,855

You can also take it to Autozone, Advance Auto, or O'Rielly/Pep Boys for a free alternator test. Replacing an alternator is simple, but you'll have to back the serpentine belt off by placing a socket on the tensioner and turning it until the belt is loose.

22,955

if your battery is lasting 3 days, it isn't the alternator- with that Benz, you should have a good Mercedes mechanic- why have an expensive, complicated car like that and try to be fixin' it yourself?

I'm a student and wanted a luxury vehicle to play around with and enjoy what's left of my youth, but didn't realize how much it has been costing me just to maintain it... Every sensor alert and every service requested I'm usually in the Mercedes shop taking care of it right away.. The vehicle had a great track record, but in my current situation(graduated from college but can't catch a break in my job search) has left me ima super tight budget.. I actually have this beautiful machine posted for sale just for that reason, if ur interested.... But I appreciate the feedback thank you

5

I had the same problem of me 13 year old Merc C230k now. All workshops I went enquired suggested alternator changed, however, from me previous researches it could have been just the alternator's control unit that sits above it that is most likely faulty as Merc's alternator failure is not aa common.

Your Answer

C-Class

Looking for a Used C-Class in your area?

CarGurus has 23,245 nationwide C-Class listings starting at $1,995.

ZIP:

Mercedes-Benz C-Class Experts

  • #1
    Lorne Grandison
    Reputation
    4,950
  • #2
    PPC123
    Reputation
    3,580
  • #3
    zabi
    Reputation
    2,550
View All

Related Models For Sale

Used Mercedes-Benz E-Class
449 Great Deals out of 19,563 listings starting at $1,500
Used BMW 3 Series
1,017 Great Deals out of 31,335 listings starting at $795
Used Mercedes-Benz S-Class
145 Great Deals out of 5,883 listings starting at $2,000
Used BMW 5 Series
463 Great Deals out of 16,477 listings starting at $2,000
Used Mercedes-Benz CLS-Class
82 Great Deals out of 2,077 listings starting at $6,995
Used Audi A4
314 Great Deals out of 10,721 listings starting at $900
Used BMW M3
51 Great Deals out of 1,469 listings starting at $4,990
Used Mercedes-Benz CL-Class
30 Great Deals out of 503 listings starting at $3,300
Used Ford Mustang
759 Great Deals out of 42,122 listings starting at $1,300
Used Mercedes-Benz M-Class
212 Great Deals out of 5,675 listings starting at $2,500
Used Honda Accord
1,044 Great Deals out of 61,437 listings starting at $999

Used Cars For Sale

2017 Mercedes-Benz C-Class For Sale
164 Great Deals out of 8,812 listings starting at $29,917
2016 Mercedes-Benz C-Class For Sale
42 Great Deals out of 1,477 listings starting at $23,763
2015 Mercedes-Benz C-Class For Sale
89 Great Deals out of 2,181 listings starting at $18,977
2014 Mercedes-Benz C-Class For Sale
59 Great Deals out of 1,729 listings starting at $13,980
2013 Mercedes-Benz C-Class For Sale
60 Great Deals out of 1,426 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.