Question about 1988 Toyota Land Cruiser

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My 2001 expedition is reading 19 volts at the battery while idiling,i just had the altenator rebuilt.All the instrumentation goes out or drop to zeros and the battery light comes on while driving.when this happens the voltmeter shoots all the way to the top

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With a digital multimeter, while the engine idling, check the voltage between (+) and (-) terminals of the battery. If the reading is 13.8V to 14.2Volts, then the charging system is O.K.
If you get 19Volts, I do not doubt it, you have serious problem with charging system, alternator-voltage regulator. Please do not operate the engine. The OVER VOLTAGE can cause severe damage to the electric and electronic system in your car. If you didn't do it. Send the car, in a car repair shop ASP get an estimate and Sue those who made the first repair. Otherwise repair the car ASAP.

Posted on Nov 06, 2010

  • jim rhodes Oct 01, 2012

    OK I have a similar issue with a GMS Yukon. I noiticed volt meter in the dash reads 19v idle, driving, and even with the acc switch on. Checked with ta volt meter 12.8 on battery running idle 14.5. still 19v on the dash. Any ideas.

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I suspect you have a faulty voltage regulator. If your rebuilder has a warranty or guarantee then I would check with him - but first find out if the regulator is in the alternator as I suspect or in the computer. If it's in the alternator then it went bad or was bad when installed - if it was even changed, as he may have just replaced the brushed inside the alternator.If the regulator is in the computer then you may need a new computer - let's hope not, right?
Good luck!

Posted on Nov 06, 2010

  • Bayyagg
    Bayyagg Nov 06, 2010

    You really got an ALTERNATOR problem!
    Replace the IC REGULATOR/DiODE in the alternator will surely solve that problem!

    Hope ur computer still works properly w/ that high voltage it got from ur ALTERNATOR, otherwise SUE those guys that repaired/sold it to you w/o testing it properly!

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