Twice in 2 months my 2012 Toyota 4runner has had a dead battery and the alarm in barely chirping.

Asked by Avalanche_2631 Mar 01, 2017 at 10:10 PM about the 2012 Toyota 4Runner Limited 4WD

Question type: Maintenance & Repair

The car was turned off, locked, the doors were all locked and no interior lights were on.  The battery readily accepted charge and ran fine.  Dealer found nothing wrong.  What caused this and what do I do about it.

2 Answers
410

Matt answered 7 years ago

put a voltmeter on the battery while the engine is running. if the voltage is under 12.75 the alternator isn't charging if it is charging then the voltage will be over 13-14

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enginecreator answered 7 years ago

Battery might have a bad cell, have it load tested if alternator is working and also check your battery terminals & terminal wires for corrosion and if tight or not. Engine to frame may be loose or frayed.

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