[btwilson86]

Actually, all that gets to the injectors is between 1 and 3 (I think) volts. That's according to the Haynes Book... What I did to "test" the electrical portion of the injectors was to take a injector plug with a couple inches of it's wire off of a donor harness from the junkyard. Take your plug and strip 1/2" of insulation off the end of the two wires, and plug the plug onto an injector. Grab a good AA battery, and touch the two wires to the ends of the battery, and if it works right you will hear a faint *click* sound. If not, then the electricals of the injector don't work right. Also, if you want to make sure your getting power from the harness into the injectors, buy a red 1.5V LED with a couple inches of wire from each lead, and stick that into an injector plug on your car's wiring harness. Have a friend crank your car over, and you should see the LED flashing rapidly. It'll be faint, as the power comes and goes very rapidly, so perform that last test at night so you could see better.

And I just realized you didn't ask anything about testing injectors or the wiring harness, so if you need to or if anyone else needs to, there you go.