If you wire them backwards, the injectors won't been harmed I don't think if you test it for a short period of time, they just won't inject any fuel. The pintle will try to move backward instead of forward, and it won't be able to move anywhere, so it won't do anything but heat up.
I honestly have no idea how I decided to do mine, but it worked out the first try. 50/50 chance I guess.
9-volt battery should be able to tell yah which is which like nsusammyeb said.
Last edited by BenFenner
on 2011-05-13
at 23-30-04.