Voltmeter - Explanation for High Readings

84chrysler10

Models


All 1984 Models Equipped With Magnetic Voltmeter Instrument Clusters


Subject


High Voltmeter Readings


Index


ELECTRICAL

Date

March 19, 1984-C


No.


08-11-84

P-982-C
SYMPTOM/CONDITION

The magnetic type of voltmeters used in subject 1984 vehicles are sensitive to heat build up inside the instrument cluster housing. The increased heat that builds up places the voltmeter indicator toward the high end of the "normal" operating portion of the meter or, under the right conditions, may just enter the "high warning" portion of the meter.

The conditions causing this high reading are as follows:

^ An hour or more of continuous driving at cold ambient temperatures (cold temperature operation causes the voltage regulator output to be higher than hot temperature operation).

^ Instrument cluster illumination lamps and/or heater/defroster on, which increases temperatures around the voltmeter.

If a high voltmeter reading exists, verify battery and charging system are operating normally per service manual procedures. If system meets specifications, assure customer that system is operating properly. Do not replace voltage regulator or voltmeter if test results meet service manual specifications.

A defective voltage regulator (overcharging) will normally cause the voltmeter to read well into the warning area (full scale) and will occur immediately, not over a period of an hour or more.


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