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Temperature Gauge: G20

  1. To check power source, turn ignition on. Check voltage between terminal No. 25 and ground. See Figure . If battery voltage is present, go to step 3).
  2. If battery voltage is not present, check for blown fuse or fusible link. Check continuity between battery terminal and instrument cluster. Check battery circuit from ignition switch and relay. See appropriate chassis wiring diagram in the WIRING DIAGRAMS  Section.
  3. Turn ignition on. Connect a test light with a 3.4 watt bulb between temperature gauge terminal "B" and ground. See Figure . If gauge needle does not move smoothly from COLD to HOT, replace gauge. If needle moves smoothly from COLD to HOT, check continuity between instrument cluster terminal No. 5 and ground.
  4. If continuity is not present, check wiring. If continuity is present, test temperature gauge sending unit. See TEMPERATURE GAUGE SENDING UNIT  under TESTING.
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