Calibration Test
Connect a test voltmeter to vehicle voltmeter circuit. Compare vehicle voltmeter readings to readings of test voltmeter. If vehicle voltmeter readings are not within allowable range of variation, replace vehicle voltmeter. See VOLTMETER ALLOWABLE VARIATION .
VOLTMETER ALLOWABLE VARIATION
| Test Gauge (Volts) | Allowable Range (Volts) |
|---|---|
| 8 | 7.2-8.2 |
| 12 | 11.4-12.6 |
| 16 | 15.0-17.0 |
- Turn ignition off. If voltmeter needle is not resting at lower stop, replace voltmeter. Turn ignition on. If voltmeter needle moves but is inaccurate, go to step 3). If voltmeter needle stays at lower needle stop, check fuse.
- If fuse is okay, measure voltage at Black/White wire of 12-pin connector on back of instrument cluster. If 12 volts are not present, repair power supply to instrument cluster. If 12 volts are present, replace voltmeter.
- If voltmeter needle moves but is inaccurate as in step 1), ensure battery is fully charged. Turn headlights and all accessories on. Note voltmeter reading. Voltmeter should read 11.5 to 12.5 volts. If voltmeter reading is incorrect, replace voltmeter.