99 Mitsubishi battery drains

New battery, New Alternator, Alternator is charging battery (13.5v while running), but sitting overnight will almost drain the battery. Alternator fuse is good. I currently have ALL of the fuses removed and plan on installing them one at a time and monitoring voltage... anyone have a faster way to figure out which circuit could be draining the battery.

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JackV

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Posted on Sep 30, 2017

JackV

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You have an electrical short issue. Check all your earthing connections to the vehicles body. Check the earthing to the engine and check for any damaged wiring causing to earth on the body. Check your sensors etc. Good luck!!

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Donald DCruz

17130 Answers
Posted on Sep 02, 2010

SOURCE: New Battery, new alternator, on

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.

mike raines

120 Answers
Posted on Feb 12, 2009

SOURCE: 1992 Mitsubishi Diamante won't start

have you had the alt. tested if not when u get it running take to the nearest auto zone they will check it for free that is what it sounds like to me that it is not charging

John DeCosta

155 Answers
Posted on Aug 15, 2009

SOURCE: 2002 mitsubishi lancer ac does not blow cold and will continue to

Sounds like either the a/c relay is bad or a/c compressor clutch is not disengaging. Look on the compressor for an electrical connector, and if you can, unplug it. That should stop the battery drain. I would suggest taking the car into a good a/c shop to have the compressor looked at. The clutch can be replaced without having to buy a new compressor.

Anonymous

2841 Answers
Posted on Sep 19, 2009

SOURCE: drainig battery

You have either a battery with a dead cell that must be replaced, or something is on and draining the battery. Check the under hood, trunk, glove box, brake, parking, and courtesy lights. Open the hood at night and remove the negative cable. When you touch it to the negative battery post if you see a fairly large spark, something is on or something is drawing power. If you see a very tiny spark that is normal as it is the radio & clock pulling power. Replace the battery.

Testimonial: "thanks, the battery is brandnew"

Anonymous

136 Answers
Posted on Nov 27, 2009

SOURCE: I have a 1995 Mitsubishi Montero LS. The voltage

easy test on alt start car loosen pos cable.then take off cable from batterie if alt is good it wont cut out.if it does,more than likely your alt. if the belt was the problem it would be noticeable by squealing and audible slipping.and most voltage regulators are built into the alternaters these day.

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Jan 06, 2013 • 2002 Mitsubishi Diamante

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You should check if alternator is fully charging up the battery after it has run, and then turned off. But if you don't have a voltmeter handy, try this: When you shut if off to sit overnight, take the negative battery terminal off the battery. When you get ready to start it, hook up the battery and see if battery is no longer weak. If battery is now good, you do have an unintended drain. If battery is weak again, check charging system, battery cables and connections, alternator connections-a loose connection will prevent battery from charging.
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If you fitted a new battery which drained overnight, that points towards a discharge somewhere in the electrical system. The battery charge is finding its way to earth somewhere.

One of the usual causes of battery discharge is a faulty alternator - the diodes in the rectifier pack (usually attached on the end of the alternator) burn out, allowing the current to run to earth.

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My 2006 subaru outback - battery goes dead after sitting a day or two - tried new battery, alternator check, charging ok, does not show excessive draw when turned off but about once a month goes dead

2006 Subaru Outback

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