Toyota pickup 3.0 4x4
Replace it or take a close look at it's wiring.
these measure very small voltages...your finger acts like a capacitor...might verify the chassis ground (cable to the motor block) is solid and not corroded, and your battery is putting out with a solid 12 volts...and not 5 or more years old (tin-antimony) batteries stop taking a charge and operate under reduced capacity~
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