Least Shoddy Fuel Sending Unit?
1. When I tested the gages with a contant voltage source of 3.1 to 3.2 Volts, the pointers all swung 7/8 full scale.
2. Same gages connected hooked up on the circuit board with 22 Ohm resistors substituting for sending units, went to 1/2 scale. The analog multi-meter showed the IVR output pulses to swing from zero to 4+ Volts at most when read on the 15 Volt scale. I have a beat up analog meter that might have a 0-10 scale. If so, I'll retest.
My takeaway is that a 5 V constant may not have the same effect on the resistance wire and gage movement as the pulsing IVR.
You guys know more about this than I. Two observations that may be relevant.
1. When I tested the gages with a contant voltage source of 3.1 to 3.2 Volts, the pointers all swung 7/8 full scale.
2. Same gages connected hooked up on the circuit board with 22 Ohm resistors substituting for sending units, went to 1/2 scale. The analog multi-meter showed the IVR output pulses to swing from zero to 4+ Volts at most when read on the 15 Volt scale. I have a beat up analog meter that might have a 0-10 scale. If so, I'll retest.
My takeaway is that a 5 V constant may not have the same effect on the resistance wire and gage movement as the pulsing IVR.
