Question about 2001 Mitsubishi Montero Sport 4WD

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New Battery, new alternator, on 2001 Mitsubishi Montero Sport - still won't charge. NTB can't figure it out. My local garage can't figure it out. Any suggestions?

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  • rdammon Sep 02, 2010

    The mechanic at NTB says he has done all the things recommended in the first response. Still not charging the battery.

  • rdammon Sep 02, 2010

    Heimlich-

    I am passing this on to the shop. Sounds promising.

    Thansk

    Gene Dammon

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4 Answers

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Yes , this is very common with Mitsubishi. You probably have a blown fuse. On some models the alternator fuse (usually 50-60 amp block fuse) is actually part of the positive battery terminal clamp and is only available from the dealer. On other models the block fuse is under the hood and located in the same box as the fuses (only it is bolted in). If the alternator block fuse blows, your charge light on the dash will not come on and your battery will not charge ( it will go dead while you drive) even though everything is working perfectly. If it is a square fuse held in by to 6 mm bolts you can get one from the auto store for a dollar. If it is a fuse built into the positive battery clamp figure $10-$25 dollars from the dealer. Grab a flash light and inspect your block fuses carefully. Do not be afraid to cut a slot into the cheap block fuse where the bolt hole is, it will save you much trouble putting it in. Sorry about the mechanic selling you a bunch of stuff you did not need.

Posted on Sep 02, 2010

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The Mitsubishi Montero Sport has a thick wire that goes from the positive battery post to the fuse block next to battery. Take the fuse cover off to see it. It is crimped with the wire that goes to the alternator to excite it to charge. It uses a 6mm 1.0 thread bolt to mount the crimp ring to the fuse block. This bolt comes loose and causes high resistance from the corrosion that occurs over time. Replace the bolt, clean the connector and the area where it attaches to. You will probably see that the plastic case around the connector has melted from the heat caused by the loose connection. Don't just tighten the bolt! The contact areas need to be cleaned. I had a shop replace the alternator, but the old one tested good so I made them put it back in and just paid for the diagnostics. I found the loose connection myself. Running great since.
New Battery, new alternator, on - 8e1e0d45-f9b0-40b5-a4ad-c45b70a085e4.jpg

Posted on Jul 29, 2014

  • Jeffrey Russell
    Jeffrey Russell May 04, 2016

    Just replaced my alternator. Still no charge. Read this comment and checked the 100a fuse. Discovered I had blown it when I started to take the lead off the alternator and arced my wrench. I then pulled the terminal but didn't think I might have blown a fuse. Thanks for your help

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Hi. You may want to check the voltage regulator as well. For this is is part of the charging system.

Posted on Sep 03, 2010

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  • Mitsubishi Master
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Most important when you replace the battery or alternator is to check the charging current to the battery. If not the RECTIFIER/REGULATOR IS FAULTY. You must check the alternator voltage to the rectifier/regulator and then the output which is the charging current in parallel to the battery.
There is a reverse voltage diode to prevent reverse flow to the alternator therby draining the battery.
So check this circuit and I hope this could be the fault.
Please check and comment , if helpful vote me.

Posted on Sep 02, 2010

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