Question about 1992 Chrysler New Yorker

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All of a sudden after replacing the alternator on my '92 new yorker (alt. not the prob. cuz it tested fine and battery also tested fine) when I turn the headlamps on all of my gauges go haywire and the dash lights shut off. But as soon as I turn them off the gauges go back to normal. It did not happen immediately after I replaced the alternator but only after driving it for about 45 min. After parking vehicle for the night, the problem did not recur again in the morning until I drove it for about 20min. Any thoughts?

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  • chuckdoster Apr 04, 2011

    I may have neglected to say that it only happens when the car is warm
    (driven for at least 1/2 hr to an hour, if that helps at all. I did replace
    the switch and it did not correct the problem. It only happens when the dash
    lights are on and if you turn the dimmer switch down it stops tweaking out.
    I'm a little lost when comes to electrical issues. Could the alternator be
    bad even though it tests ok?

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There is a problem in the Light switch itself or the ECM. Replace the light control switch and see if that resolves the issue.

Posted on Mar 25, 2011

  • James Young Apr 05, 2011

    It is most likely the Light switch. because it only happens after it warms up a bit that could be pointing to an ECM problem but I would replace the switch first. It certainly could be the Voltage regulator even though the Alternator tested good. I don't remember if the alternator was combined with the Regulator. If they are separate the whole problem could be the Voltage regulator. If it were my vehicle, I would take the alternator to a different part store and have it load tested first, if that is good then replace the light switch and if the problem persist after that then replace the Ignition switch. After replacing all of that if the problem still exist you will have to look at the power distribution box under the hood and make sure you don't have any frayed or Burned wires and start considering the ECM module. Leave the ECM for last, it is the most expensive part in the bunch.

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