Question about 2001 Mitsubishi Montero

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My baterry keeps on going dead and i had the altenator checked and it passed

Ihave replaced the battery 3 times and it keeps on going dead i had the alternator checked and it passed all the tests not to long ago it went dead while i was driving

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  • capinv24 Oct 23, 2008

    My battery goes dead overnight too. Ckecked the alternator and it shows 13.5 volts. Replaced battery, still same problem. Checked all interior lights are off, including radio, A/C and alarm. When I check to see if any loads exist while car is off and all light, etc is off, I get 0 loads. Still the next day, Battery is drained. How do you check the regulator?

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Here's the key parts of the electrical system.
Battery: the source of your electrical energy
Alternator: The charging source for the battery. Driven by the engines rotation via a fan belt
Regulator: tells the alternator when your battery needs to be charged and how much.
The Load: all of the devices that use the batteries energy

If you have replaced the battery 3 times we can rule out the battery as the problem
You had the alternator check and it passed. We can rule out the alternator
The load: It's fixed and for the most part you can control most of this with knobs on the dash
That leaves only the regulator. If the regulator is giving bad info to the alternator that could account for the problem.

Try this ( if you don't have a voltmeter, places like AutoZone can make these measurements)
Start the engine and measure the voltage at the output of the alternator. It should be about 13.5 to 14.0 volts. Then measure the voltage at the battery terminals. It should read the same as what you got at the alternator. If it's not,check the battery cables for clean bright connectors. Use a battery terminal brush to clean the. If this still doesn't help check the regulator.

Hope this helps

Good luck Loringh

Posted on Oct 23, 2008

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