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Where is the fuse on a mercedes c240 2002 for the alternator ?

Replaced battery but wont keep charge.

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

SOURCE: Replace Cabin Filter in my 2002 C240 Mercedes Benz

after changing air filter and spark plugs engine still shakes ???

Posted on Jun 19, 2008

SOURCE: Charging problem.. Wont charge battery

The instructions for installing a new alternator usually read to fully charge the battery (12.3 - 12.8 volt range). Otherwise, the alternator will be damaged when it initializes. I have seen some extreme damage result from installing a new alternator with a low-charge battery. The torque required to turn an alternator when damaged in this scenario is unbelieveable!

Posted on May 02, 2009

  • 1 Answer

SOURCE: i have a 02 mercedes c240, the battery dies every day, replaced battery and it keeps dying, i have to jump it off every time i drive it. please help

one of the problems could be , you have a bad drain on battery, check charging system,if you disconect battery and hook it back up does it ark if so check all elecrical components for drain

Posted on May 26, 2009

  • 1 Answer

SOURCE: replaced alternator and battery is good but not charging

I found the problem YEAH. It was the fuse that is in the side of the fuse box under the hood, Its where the battery wire from the alternator connects thru a fuse to go to the battery, Its one hundred and something volt fuse. It took care of the problem instantly.... Thank you all for your replies...

Posted on Sep 02, 2009

jasperoni
  • 203 Answers

SOURCE: How To Change Oxygen Sensors in 2002 Mercedes C240 Sedan?

I do not know the part numbers but you have 4 sensors. 2 pre and 2 post catalytic converter. The pre sensors are the most sensitive and are generally the ones to fail. the rear sensors usually have a heater circuit problem. If your just replacing them for routine service interval I would just do the fronts. They connect to the engine wire harness in the front of the transmission pan. You may need an o2 sensor socket to remove the fronts. They are just a 22mm. in size.

Posted on Oct 18, 2009

Testimonial: "Thank you for the reply...I appreciate your time! Will replace front O2 sensors and see if check engine light goes out...thanks again...Jamie."

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1 Answer

Location alternator fuse


What do you mean "charged alt"?
The Alternator either works or it doesn't.
There is no fuse in the alternator circuit.
If the Battery is not getting charged while you drive, then the Alternator is at fault.

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check the voltage at battery with car off. it should be at least, 12-13 volts. then start the car. if alternator is charging it should read at least 13.5-14.2 or better. to test and see if alternator is ok. remove negative cable to battery while running. if car does not quit its ok, if it does its bad or you have a wiring problem. this is how I check for a bad battery as well as above! hook volt meter to battery, turn on headlights with car off. if it drops way down battery is bad. check all fuses and ground wires to charging system if need be.

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I REPLACED THE ALTERNATOR IN MY 2001 MITSUBISHI MIRAGE AND THE BATTERY BUT IT STILL WONT CHARGE ,THE NEW ALT. WAS CHECKED AND IS GOOD. ALSO ALL FUSES ARE GOOD. AM I MISSING SOMETHING?


You need to check the charging circuit which is most important to the automatic charging of the battery to keep it in brim condition. Hence the alternator current will feed into the charging regulator which determines how much the battery needs to be charged . check this unit by tracing the alternator wiring and use a ammeter to check the battery charge current. get help if you are not equipped.

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The alternator is unserviceable which doesn't keep the charging system going.When the battery is fully charged the vech will run and drive for a while until it drains the charge down in the battery because it isn't being replaced by the alternator......Hope this helps.

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2 Answers

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If you have a fuse it will be in the power distribution center near the battery main fuses and relays are inside.
Check the charging system with a volt meter right at the battery. Battery standing charge should be no lower than 12v if charging you should read between 13 and 14 volts running, about 13 with all electricals turned on. If not, the alternator isn't working OR the regulator has failed. (some regulators are part of the main computer but you need to check which system you have. AND do check for fuses.
If charging system is working you may have a system draw that is pulling the system down overnight. Check that with an ammeter between either cable (removed from battery) and battery connection...pull fuses one by one till draw disappears then check components in that system. Don't be concerned with "low Draw" items such as radio that always pulls something to keep memory and clock working.

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1 Answer

I have had the alternator replaced twice, but it wont hold a charge and keeps draining my battery. What else could be wrong?


First, make sure to check that the alternator is actually charging the battery. Then connect an ammeter between the battery lead and the battery (either one) and start checking for draw by removing fuses one by one till it goes away.Then go into that system to find the source of the problem. You did make sure that the battery is good?

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Dead battery. Alternator is charging, but the juice is not getting to battery. 1998 Slk 230. There is a relay p/n 002 542 20 19 05 3905 00, by the battery, (G) from the alternator has 19.8 volts, battery...


19.8 volts is too high. the alt regulator is not working. The regulator needs a battery source feed to work. Both the feed for the regulator and the connection between the output post and the positive battery terminal should go through an ALT fuse. Start by checking that.

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