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Someone else had a problem with a CLK, his battery was in the trunk but if the battery voltage is low he says the trunk won't unlock. I think you need experienced help? Call the Merc dealer to find out how to open bonnet and trunk.
Check the idle rpm (efi around 900 rpm ) carby around 750-800rpm. Very few alternators charge under 750 rpm as it requires 14 volts to charge the battery and at low revs the alternator will be producing around 11.5-12 volts. Check tension and condition of drive belt.
The battery needs to be inspected.Either battery voltage low or battery is weak and needs replacement or the Battery terminals are loose or dirty.Try cleaning them with contact cleaner then reconnect and see if the problem still exist.For more help.Go through Mercedes repair guide.Mercedes Benz Car Repair Guide?http://repairhelpcenter.blogspot.in/2012/03/mercedes-benz-car-repair-guide.html -----------This will help.Thanks.
the alternator is not charging
that can be from problem alternator , wiring ,fuse , voltage regulator, incorrectly adjusted alternator drive belt or dead battery
best have an accredited auto electrician check it out by bench testing the alternator and voltage regulator and load testing the battery
loose or dirty /corroded battery terminals will also be a part of the problem
if the voltage regulator is integrated with the ECM , you will need a replacement ECM
BUt get the proper diagnosis done first as that will save cash
have the alternator bench tested for faulty rectifier diode pack
it may be charging the correct voltage but it is AC voltage and not DC voltage
in which case the battery will die quickly
next to check is the voltage regulator
it has to be 4.5-14.8 volts DC and if it in the ECM unit , will require a new ECM to fix
This is normally a low voltage from the alternator condition. Hook a voltmeter to the battery and note the reading. Should be 11.6vdc to 12.2vdc. Start the car, after a minute or so it should be around 13 to 14 vdc., if not then the alternator may be bad
probably the battery needs a replacement. why did the battery go flat? alternator may also have been conked off. check alternator belt. also take it to a battery place and have the leads tested for appropriate voltage levels and water levels inside the battery.
i had the same problem with my dash saying battery voltage low and the problem was my alternator. took it to the dealership and it cost me $400.00 to replace a connector on the alternator because for my year car a (2002) they don't replace entire alternator.
It is believed that the Tomtom lead, which was permanently plugged in to the cigarette lighter, has caused the battery to drain, when the engine is not running. Has anyone else experienced this problem?
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