Question about 1998 Mitsubishi Eclipse

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My Eclipse is having problems keeping a charge in the battery. I have installed a new alternator and battery and the battery continues to drain, making it impossible to get my engine to turn over and start. I was wondering if anyone had any ideas as to what could be the problem

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Make sure your alternator is good, could be a defective one, with test light and engine running check voltage at battery should have no less then 13.5 volt's, if less return and get another one, if that check out good turn every thing off in the car if there a light under the hood unplug it, disconnect neg. cable at battery, with test light hook one end to disconnected battery cable and other end to neg on battery, if light come on there is a voltage draw and will drain the battery, start pulling one fuse out at a time, when test light goes out that the circuit you need to start checking.Good luck.

Posted on Feb 05, 2010

  • Alexander Mimun
    Alexander Mimun Feb 05, 2010

    With voltmeter check alternator voltage at battery engine running should not be less then 13.5 volts. Sorry about the typo above


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It sounds like you may have a parasitic drain on the battery. to check, you'll need a multimeter set to check amperage. disconnect the negative terminal from the battery, put the black lead from the multimeter on the negative post on the battery. put the red lead from the multimeter on the vehicles negative cable. you should see a short spike (a second or two) initially for the security system, relays, etc. after that, you should only see a draw of approximately 30-40 mA for the digital clock, radio memory settings, etc. it's also possible that you may have a bad diode in your alternator, which would allow it to draw current away from the battery when the vehicle isn't running. using the same method, check the battery drain after unplugging the alternator's electrical connector.

Posted on Feb 05, 2010


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You have an electrical short issue. Check all your earthing connections to the vehicles body. Check the earthing to the engine and check for any damaged wiring causing to earth on the body. Check your sensors etc. Good luck!!

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You have several choices;
) You can get the alternator check at an auto parts store. Most do it free. You will have to take it off.
) You can get the entire charging system check at Sears. The checkup is free.

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Try replacing the alternator and let me know if you have any more problems.

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