how to bench test a 70 Dart instrument cluster?
Varying test resistances.......this has been posted many times.......
This photo came from an aftermarket "copy" of the OEM gauge test box, which is simply 3 resistances. They check if the gauges go to "1st mark," middle of scale, and "full" mark
So you need something that is either these three resistors or a variable (rheostat) such as a spare fuel tank sender, which you can set with your ohmeter
The three resistors are in YELLOW
Now what you're functionally testing is the complete circuit path which is as follows in your test set up:
From POS post of battery---to ignition "run" pin of PC board harness connector----to board trace to IVR unit---via board traces to the oil and fuel gauges---through the gauge---out on the board trace and to the PC board connector pin for the oil or the fuel sender---connect your resistor----to ground........and back to battery negative
The current through the resistor--more current for a lower resistor, causes the gauge to read HIGHER on the scale.
Varying test resistances.......this has been posted many times.......
This photo came from an aftermarket "copy" of the OEM gauge test box, which is simply 3 resistances. They check if the gauges go to "1st mark," middle of scale, and "full" mark
So you need something that is either these three resistors or a variable (rheostat) such as a spare fuel tank sender, which you can set with your ohmeter
The three resistors are in YELLOW
Now what you're functionally testing is the complete circuit path which is as follows in your test set up:
From POS post of battery---to ignition "run" pin of PC board harness connector----to board trace to IVR unit---via board traces to the oil and fuel gauges---through the gauge---out on the board trace and to the PC board connector pin for the oil or the fuel sender---connect your resistor----to ground........and back to battery negative
The current through the resistor--more current for a lower resistor, causes the gauge to read HIGHER on the scale.