64 Valiant IVR test

BobW said
OK, I just did the temp sender wire check and as mentioned the voltage on my digital jumped up & down. I'm guessing the regulator/limiter is an all or nothing function.
I can live with knowing the temp sender works and what range it displays.
Next time my tank is empty I'll pull the sending unit and check it's range. It may be an aftermarket replacement unit, so I understand that can be suspect.
Thanks for the info.
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That jumping of the meter is probably the meter is unable to average out the mechanical aspects for the IVR. It is a 12V duty cycle output that 'averages' out to approx 5V, not a pure 5vdc. Try a different DVM or an older analog meter. I have had a few original IVR have a low duty cycle output causing the oil pressure, water temp and gas to read low.