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Multiplex function my car battery keeps draining over night with notthing left on it did start a couple of times with a jump now it dont I was told it could bethe driverside multiplex control unit how hard is it to do myself

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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

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  • 1 Answer

SOURCE: Battery drained completely BMW E90 2005 model

Connect your old battery with another battery from another car (WHILE KEEPING ALL CABLES CONNECTED ON BOTH CARS) just user a bridge cable otherwise you'll need. a code to reactivate your BMW again. Try now to start your BMW engine. Now go to the nearest battery dealer to change the battery WHILE KEEPING YOUR ENGINE ON, otherwise you'll need a code to activate your BMW again :)

Good Luck!

Posted on Jan 04, 2009

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mrfixitrick
  • 7 Answers

SOURCE: car battery problem

The alternator test will likely indicate a charging problem from the alternator that is not keeping the battery charged up.
Regardless of the alternator test, it would be best to do an electrical draw test to determine whether there is an excess drain on the battery. This can be done with an ammeter between the positive terminal and the positive battery post. This test is done with key off, all accessories off, no lights on, etc. There will be a small draw on the battery in all newer vehicles, but it should be in the order of up to 50 milliamps. If you are getting more than 200 milliamps of current draw then there is a problem with an electrical system that will drain the battery over a period of days or weeks. Once you know this is true, the electrical systems can be methodically tested.

Posted on Jan 19, 2009

  • 1 Answer

SOURCE: 2000 Jetta Radio is dead after a dead battery jump start

Some German cars have anti-theft device inside to make it useless to steal...check at the dealership to see if jumping the battery will activate this(the car thinks its being stolen) .

Posted on Apr 29, 2009

  • 19 Answers

SOURCE: car wont start after battery drained

Damaged cell in battery. Buy new battery.

Posted on Jun 18, 2009

  • 8404 Answers

SOURCE: Cars battery drains every night. local car repair

One by one, disconnect the fuses until you see no change on a volt/ohm meter connected to the battery with the engine not running.

Posted on Mar 06, 2010

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Hi Jessica, A fully charged battery is 12.6. The links below are a couple of youtube video on how to find out if a car battery has a power drain, The 1st video starts with the guy loosening the negative lead to the battery then turns the multimeter on and sets it to 20 DC, plug bottom of lead to current mode and places 1 multimeter lead on top of the terminal inside the negative lead and the other multimeter lead on the negative lead and wiggle the negative lead off the battery, The current being drawn from your battery should be less than (5.0) 50 mille volts..... The reason he takes the negative lead off after connecting the multimeter this is to save any codes from the car as technically the battery isn't disconnected.. Also, There's videos down the right side you might find helpful as well.........CHEERS..
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Sounds like a bad alternator. Drained your battery and when you turned on the lights it took all the power left in your battery. When you drain a battery down that far, they are real hard to jump, and coupled with the alternator, the car is not producing enough current to start and stay running.

I would take the alternator off and take it to oyur local auto parts store to be tested. If bad, replace it and charge the battery fully before starting. Then check voltage at battery with motor running. Should be 13.2 -14 Volts DC. If not, you may have a bad battery cable or blown fusible link. (especially that if the alternator tests good).....Mike

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