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Tachometer Does Not Operate (Diesel)

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Pickup, 1999 GMC Cab & Chassis, and 1999 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect instrument cluster connector. Disconnect generator connector. Connect test light between generator connector terminal "A" (White wire) and ground. See WIRING DIAGRAMS . If test light does not illuminate, go to next step. If test light illuminates, repair short to ground in White wire between instrument cluster and generator.
  2. Connect test light between instrument cluster connector terminal No. 6 (White wire) and generator connector terminal "A" (White wire). See Figure. See WIRING DIAGRAMS . If test light illuminates, go to next step. If test light does not illuminate, repair open in White wire between instrument cluster and generator.
  3. Reconnect generator connector. Start engine. Connect voltmeter between instrument cluster connector terminal No. 6 (White wire) and ground. See WIRING DIAGRAMS . Check for pulsating voltage at or below 14 volts. If voltage is present, replace instrument cluster. If voltage is not present, replace generator.
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