I find it hard to believe that you can read a signal from the PCM fast enough with a Voltmeter and not a scope.
Are you telling us that you test the NON-Red leg by placing your voltmeter positive lead in the back connector and ground lead to chasis/battery grnd and you are getting a voltage signal with the key on in run engine running?
Your injector COULD not work with both leads receiving +voltage. That would be AC and your car is DC.
Dart 348ci, Ed Curtis cam/valvetrain, Precision 76mm, Holley Dominator EFI, CNP ignition, tons of Holler EFI small parts, 4"dp, 4R70W w/T-brake, new suspension coming soon.
Little 750rwhp at 6,000rpms and only 10lbs of boost before we just got tired of playing with clutches. New 4R70W and we are turning it up. Expecting 1,000rwhp.