i just got an nx plate system for my car and i have 1 question. on the fuel and nitrous solenoid there are two wires that look the same i know on is a ground snd one is a positive but how can u tell when they look the same???

 

i dont think it matters. ive never seen a solinoid labled + or -

 

nope doesn't matter.........take your pick it'll open either way