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Car wouldn't start, tried to charge the battery, blew 2 chargers. Tried to take the battery out and the alarm goes off as soon as the battery is disconnected and only stops if battery reconnected.
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Stick your key in the ignition and turn to start. That should stop the alarm. However, it sounds like your battery still isn't fully charged. Computer things go haywire when battery voltage is 9.6 volts or less.
put key in ignition turn to number 2 and press the fob buttons open close etc. see if that reset system. also if you charged the batter while on the vehicle you can only charge them with a tried and tested charger from mercedes as you can damage the engine management unit and the voltage control module fitted to the vehicle. failing that you will need to remove the negative lead on battery and leave off for an hour or so. and reconnect, the alarm will still go off until its internal battery goes flat ruf 30min or so. when reconnecting battery make sure the doors are all unlocked and boot is unlocked, you also will need the code for the radio and other units that can be in the vehicle from manufacture. if this does not work then you may need another unit to replace before the engine will start again as it has been damaged. when battery connected sit in the vehicle and turn ignition to number 2 and press fob to lock unlock doors then try to start engine if all goes well the engine and alam will not be a problem anymore
Put it on medium or the quick charge. If it has a start or boost on it put it on that and try to start the car. Do not leave it on a high rate (start or boost)for long periods or the battery could explode.
I would change the battery and make sure it has a good charge. Or take that battery to auto parts store and have them test the battery to make sure it is good. If it is, have them do a fast charge. If that don't work I say you might have a grounding issue
Once the battery goes flat so the immobliser comes on.you need to reset the system as soon as you connect up the jump leads,then try and start it OR charge the battery up in the car (take off one of the leads before you do this)see my tips re alarm reset for VW as they are the same.
had same problem outside restaurant, pulled cable off battery but every time i reconnected the alarm would go off, wound up calling AAA he was stumped and called a friend of his who said use key to open trunck.we laughed at him as we tried it but............................it worked, the alarm turned off and no problems since (2 mos)
just silence the alarm and continue to charge the battery... i'm thinking that has a battery back up in case someone attempts to cut the power to steal the car
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