Post by
mad4datsun »
https://forums.nicoclub.com/mad4datsun-u213492.html
Fri Jan 04, 2013 9:05 am
I know on nissan injector plugs if you look at the inside there will be a small + sign by the positive terminal, also the pos wire is generally a thicker gauge then ground, that's how I wired in my injectors.
But on base principle a fuel injector is just like any other PWM (pulse with modulation) solenoid so no, poles do not matter except for what gauge wire you are using if you want to get super anal about proper gauge size. And basically all the ECU does to the injector is provide a ground current for the solenoid to open.
hope this helps