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Where is the instrument voltage regulator

(1990 Chevrolet Lumina APV)
in Largo, FL on September 03, 2011
all the gauges are out of wack
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on September 03, 2011
Customer Concern: Tachometer, speedometer and voltmeter are dead. Fuel gauge is stuck at 1/2 full. Oil pressure and coolant temperature gauges work correctly.
Tests/Procedures: 1. Verify the GAUGES and the IGN fuse are good and have 12v across them with the ignition on.

2. Remove the Instrument Panel Cluster (IPC). With the ignition on, verify there is power at terminals C5, D5 and D10.

3. Check for good grounds at terminals C7, C8 and D8. If necessary, check the ground G200 located at the base of the A pillar.

4. If good, replace the IPC.
Potential Causes: Instrument Panel Cluster (IPC)
Instrument Panel Cluster (IPC) Circuit

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