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Discussion Starter #1
how do I test my IDM in a 97f250 4x4 manual trans? will a 99 f250 4x4 auto trans work in my 97?
 

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Discussion Starter #2
what voltage should be at the plug to injector (gasket) with key on in run position?
 

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all 94-2003 7.3L IDM's have the same output voltage from the factory, though there are 4 different model numbers.

They are interchangeable.

To check voltage, you'll need an oscillioscope, as the voltage at the injector wiring is a PWM signal...so a (normal/DVOM) voltmeter won't be able to 'catch' the short (.002s or shorter) signal from the IDM.

if you have an oscilloscope, you will look for a signal that looks similar to those shown here, stock 94-03 IDM's output 110vdc regardless of the IDM model number.

7.3 IDM and Injector Waveforms
 
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