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Temperature Gauge

  1. During tests, DO NOT  apply 12 volts directly to temperature sender terminal or the sender unit will be damaged. Idle engine, with all accessories off, until the thermostat opens and coolant temperature stabilizes. Gauge pointer should register in the lower half of the normal band.
  2. To test gauge, proceed as follows: Disconnect gauge lead from terminal at sender unit. Connect lead of a 12 volt test lamp or positive lead of voltmeter (20 volt scale) to gauge lead that was disconnected from sender unit. Connect other lead to a good ground. Turn ignition to "ON" position. A flashing lamp or fluctuating voltmeter indicates instrument voltage regulator is good and gauge circuit is not interrupted.
  3. If a pulsating voltage is shown but gauge is not accurate, perform a calibration test. If lamp stays on, or voltage reading is steady, replace IVR. If no voltage is indicated by voltmeter or test lamp, check for an open circuit in IVR, gauge windings, or printed circuit.
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