If you want to test the resistance/impedence (same thing as far as this is concerned), you don't have to hook it up to a power source. Just grab your multimeter, and set it to ohms, then touch the terminals on the injector. I don't know what they are supposed to be, but test them all, if you have one or two outliers.......you can figure it out. Someone here can probably tell you what its supposes to be.
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