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Early Models (With Last 6 Digits Of VIN Less Than 450021)

  1. To check power source, turn ignition on. Check voltage between instrument cluster connector 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 power circuit between battery terminal and instrument cluster. See appropriate chassis wiring diagram in WIRING DIAGRAMS  . Check ignition switch and relay.
  3. Turn ignition on. Connect a jumper wire 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 connector terminal No. 5 and ground. See Figure .
  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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