Specifically, connect a 2.2K Ω resistor between the two outside terminals of a 5K Ω linear taper pot (C), then jump the center terminal of the 5K Ω pot to one of its outside terminals (Fig. " Basic" gauge tester: To test gauges only rarely, connect a 2,200 ohm (2.2K Ω) resistor in parallel (A) with a 5,000 ohm (5K Ω) potentiometer (B) (aka, pot), effectively creating a zero to ~1,500 ohm (1.5K Ω) variable resistor. Construction is simple using a few components obtainable from any reasonably stocked electronics supply. What do you do if you don’t have access to an instrument panel gauge tester? Build one.įor nominal cost, a useful tool can be constructed that will test any OEM electric gauge in GM trucks that requires an external sending unit (circa 1967 to ~1990).Practical meter skills, a decent multi-scale volt-ohm-milliammeter (VOM), digital volt-ohmmeter (DVOM), or digital multi-meter (DMM) and an instrument panel gauge tester or variable resistor (potentiometer - Fig.Safegaurd your meter - when using an ohmmeter to measure the resistance of any circuit component, make absolutely sure the circuit is powered OFF before and while the meter is connected!.All sender resistance specifications are exact values expressed in ohms (Ω).Refer to the Wiring Manuals in the 73-87(91) GM Pickup Manuals thread located in the General Information and Maintenance section of the Technical Forum for model-specific wiring schematics to aid your diagnosis. It will not, however, substitute for skilled voltage drop measurements, methodic inspection of connections, tracing circuitry, or pinpointing short circuits! This procedure cannot effectively test an unpowered or improperly grounded gauge circuit therefore, it is strongly recommended that gauge power and ground be fully verified if the procedure indicates that the gauge under test does not function correctly. The procedure described below will functionally test OE analog gauges, verify gauge calibration, and help diagnose sending unit problems.
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