Question about 2004 Mitsubishi Montero Sport

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Brake and battery light on new battery and alternator installed

3rd alternator on car. After a dead battery a month ago, first replaced alternator lasted about 1.5 weeks. Battery light and brake light came on. Took to autozone, and given a replacement alternator. Installed new alternator, was over charging the system. Took car to mechanic and had alternator replaced by professionals. 3rd alternator lasted about a two weeks, and now is showing the brake and battery light, but very dim while in drive and brighter at idle. All electrical items seem to be fine, nothing is noticable other than the brake and battery light on the dash. All alternators have been rebuilds, I find it hard to beleive that i am 3 for 3 with getting bad rebuilds. Connections seem to be good, could this be a fuse or something else stupid? any help would be appreciated.

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  • 5,341 Answers

Wouldn't be a fuse, but it seems as if the alternator is still not putting out normal power, or else your battery has a problem taking a charge. Better have the battery tested for a dead cell. also see what a voltmeter says about alternator output now. If you have an electrical problem in the wiring somewhere or in the alt. charging controls, then possibly one or more of the diodes in the alternator may got burnt out. That means the alternator puts out less power.
On some newer cars, the engine computer, pcm, controls the rate of charge of the alternator. So you have to be careful diagnosing -know how your system operates. That's why mechanics always ask for year, make, model, and engine size if applicable.

Posted on Mar 19, 2017

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Posted on Jan 02, 2017

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dopaMEAN
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SOURCE: New battery and alternator - still won't charge

try the battery connectors if you haven't already... sometimes replacing these is all that is needed to get the charge back.

If not.. check out a new starter.

Posted on May 17, 2008

SOURCE: alternator and battery issue

Did you fully charge your battery before you ran the new alternator? If not, the alternator is damaged and will have to be replaced.

If your battery has a dead cell it definitely destroyed your new alternator.

Do you have a voltmeter. Do you know how to measure battery voltage?

Posted on May 04, 2009

  • 1 Answer

SOURCE: 1999 Mitsubishi Montero XLS Sport has an

I have had a similar problem with mine. The repair shop is telling me there is oil seeping into the alternator and shorting it out. I am going to soo if I can put some sort of shielding around it to prevent this.

Posted on Sep 24, 2010

  • 2926 Answers

SOURCE: 2001 Mitsubishi Galant. Battery

P0421 is not the cause for a no start condition. It is a catalyst warm up code related to an O2 sensor. What is the engine size and mileage on the vehicle? Was the fuel pressure checked? If so, what was the reading? Is the engine getting GOOD spark vs. weak?

Posted on Dec 27, 2010

  • 215 Answers

SOURCE: 2001 Mirage 1.8. Battery

Sounds like you have a bad ground for your brakes lights. I would start by checking the light terminals in the back for damage, corrosion, or even burn marks. If you do find some they those terminals need to be replaced. There will also be a ground wire with a nut or bolt in the area around the light make sure it is also clean and free of corrosion and verify it is tight.

Posted on Mar 08, 2011

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