I have a 1997 montero sport. It's been a great car but over last couple years I've replaced the altenator 3 times and the battery twice. Everything gets dim in my car and I start loosing all power until the car dies. Woul it be possible that there is a wire that is grounding somewhere that makes my car over time loose all it's power. Bad battery cables, stereo wires? I want to keep it because I love the car but it has stumped me. After I put an altenator in (under warranty so I'm not spending the money, takes me 20 monutes to put new one in) it run great for 6 months and I have same problem.

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Hi manolonusa,

It may have something to do with your headlights, but my first thought is they are just a symptom of another problem.

I'd check on the alternator. If the ALT fails, a good battery will keep the car running for quite a while. Sometimes the first symptoms are the dimming of the headlights. So:

• Make sure belts are tight.
  
• Get a meter and test the output voltage while its running (be careful when doing this).
• Check the voltage at the battery when stopped and when running.
• Same thing with headlights on and off.

SOURCE: Vehicle looses power and dies without warning

did you checked yoour battery cables ? you must also check your computer and fuse box to make sure that they are seald well and not letting water to enter

SOURCE: Alternater trouble Mitsubishi Montero Sport 2003

ck the alternator cable from alternator to battery...also ck maxi fuse...

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it sounds like you have blown fuse to the Alternator.. I don't know what car you are talking about but they charging systems vary.. But if alternator isn't getting all the power it needs it won't charge. this should be checked.

good luck