Drained battery

Asked by GuruBY7FR Dec 14, 2018 at 11:03 PM about the 1999 Mercedes-Benz C-Class C 280 Sedan

Question type: Maintenance & Repair

All Questions
Goat630 9 years ago Battery drain
Like it state above, I have a 99
c280. I have brought this to two
deferant mechanics because the
battery(new) keeps dying. First
mech said it was the amp, so it
was unhooked, little bit later the
battery died, brought it to a
differant mechanic and saw that
the trunk light was staying on. So
that was takin out. Well the bAtter
is still dying. Is this car known for
this problem? Does anyone have
suggestions as to what could. Be
the problem? Any imput would be
greatly appreciative. Thanks guys!

4 Answers

GuruBY7FR answered 5 years ago

I unhooked the positive battery while the car running, its still running, so means alternator is good

Mark helpful
7,455

Brian answered 5 years ago

Both of the mechanics should have done a parasitic draw test. Perhaps there is another accessory drawing power such as a dome light or aftermarket radio. To answer your question concerning "Is this car known for this type of issue?" Well many cars can have this problem, does not matter what make or model. Good Luck!

2 people found this helpful.
Mark helpful
30

GuruBYG4J answered 5 years ago

Unhooking the battery while running will blow out the diodes in the alternator and cause a hard draw that will kill a battery in a hurry.

3 people found this helpful.
Mark helpful
22,310

Guru9FSV8 answered 5 years ago

NEVER unhook a battery while running. With todays computer systems, you will blow these expensive units. Also like another said. Do a parasitic drain test to determine all circuits pulling on battery while off.

3 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • Drained battery 4 Answers

    All Questions Goat630 9 years ago Battery drain Like it state above, I have a 99 c280. I have brought this to two deferant mechanics because the battery(new) keeps dying. First mech said it was th...

    1999 Mercedes-Benz C-Class C 280 Sedan

    -

    Maintenance & Repair

  • car battery dead overnight 3 Answers

    battery seem to be drained over a period of time

    2002 Mercedes-Benz C-Class C 240 Sedan

    -

    Maintenance & Repair

  • battery 1 Answer

    2011 c300 dead battery it was old so replaced it. started right up but radiator fan comes on full at start up, and i lost all climate control on dash no lights heat or ac. fuses all good does the co...

    2011 Mercedes-Benz C-Class C 300 Sport 4MATIC

    -

    Maintenance & Repair

  • Mercedes 320 SC, 2013. New battery dead in a week 4 Answers

    Hi, my old battery drained out rapidly, within a week or two sometimes if the car wasn't driven, so I had a new one installed and it too was dead within a week. Had it recharged and same is...

    2003 Mercedes-Benz C-Class C 320 Sport Coupe

    -

    Maintenance & Repair

  • car battery appears to be dead 3 Answers

    recently when my car was being worked on by a neighbor he disconnected the battery to change an electrical related part... he realized he shouldnt have closed the trunk and now he doesnt know how to...

    2000 Mercedes-Benz C-Class C 230 Supercharged Sedan

    -

    Maintenance & Repair

C-Class

Looking for a Used C-Class in your area?

CarGurus has 1,380 nationwide C-Class listings starting at $4,499.

Postal Code:

Shortcuts

Search Mercedes-Benz C-Class Questions

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
23 Great Deals out of 549 listings starting at $5,450
Used BMW 3 Series
58 Great Deals out of 1,178 listings starting at $3,495
Used Mercedes-Benz S-Class
16 Great Deals out of 195 listings starting at $7,999
Used BMW M3
9 Great Deals out of 91 listings starting at $15,250
Used BMW 5 Series
24 Great Deals out of 319 listings starting at $5,299

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.