Question about Mitsubishi Lancer 08 2008

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08 lancer battery keeps going dead tried 3 new batteries installed,had new belts installed as per recall,alternator checks out

Battery keeps going dead. tried 3 new batteries.had new belts installed.alternator ok. have to have it jumped started when I want to use it.

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  • Mitsubishi Master
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Based upon what you have said, it would seem that you have something that is causing a continuous battery drain. Have you added any new electronics to the vehicle that may have accidentally been wired up to a constant hot source instead of one that is controlled by the ignition switch? Many enthusiasts accidentally install stereo amps directly to hot and find they never shut off, killing the battery. If you are skilled at electronic troubleshooting, you may be able to track down a wiring problem yourself. I will warn you that many repair shops will attempt to diagnose your problem, but few are trained to do it efficiently. If you decide to pay a pro to fix it, go to an Auto Electric specialist. They charge more per hour, but will take far fewer hours to locate and repair the problem than the corner mechanic.

Posted on Mar 28, 2015

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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

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