Question about 2002 Mitsubishi Lancer

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Charging system The battery light, and the brake light will come on, glow at times, and then go out for miles. Then whilst this is happening, the charge rate at the battery posts goes up to 18 volts.  the engine actually slows down a little bit. The battery stays charged but I'm concerned the overall problem could get worse. Now the 'check engien light' comes on, but also goes aout after a bit.  I have checked and 'repaired' grounds, but no change. The code seems like it is very slight. [can't remember what it was] Yes it has a new Interstate battery, and it has already had one 'new' alternator installed.  I am a [retired] auto mechanic, but this has me stumped. Help! sincerely  Dwight

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  • dwight603 Dec 29, 2008

    Your reply;

    18 v is way to much the alternator is faulty . If it keeps putting out power like that it will damage the electrical sensors when you are driving the car keep headligt on high to drop the voltage down replace alternator or take it back hoplefully the other problems will go the sensors on the engine work on very low volts this high voltage will make them read wrong to the computer

    A new alternator has already been tried!
     It didn't help!
    Is it possible that a body computer is casuing this?



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Howdie sounds like the alt,is at fault just check the plug at alt, and see if it is loose ,and see if you pull the positive post and see if its still run smooth l,m old school try it it don,t cause any problems you don,t leave it off to long see if it surges that's asigh that the alt, is goin they have abody controll module now a days that can go now nowadays rare though

Posted on Jul 25, 2012

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18 v is way to much the alternator is faulty . If it keeps putting out power like that it will damage the electrical sensors when you are driving the car keep headligt on high to drop the voltage down replace alternator or take it back hoplefully the other problems will go the sensors on the engine work on very low volts this high voltage will make them read wrong to the computer

Posted on Dec 29, 2008

  • Angelo Attard
    Angelo Attard Dec 29, 2008

    the alternator has a built in regulator that keeps the volts around 14v just because it is new dosnt mean it good try a different volt gauge to see if its reading correct or go to a auto electrian and get them to check voltage output of alternator

  • Angelo Attard
    Angelo Attard Dec 29, 2008

    hi its 130 am here ley me know how you went and i will respond in the morning



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