Nissan Repair: 1990 300zx injector wiring, vg30, hi chris

Question
hi rob i have a 1990 300zx n/a m/tranny and it had wiring problems so i bought 6 Fuel injector wire plugs to replace the old ones because they where brittle and corroded so let me me get to the point i cant figure out with one is positive or negative because each individual Fuel injector has different color wires maybe you can help, thank you.

Answer
hi Chris, altho i am not an expert on vg30's, i am aware that the engine bay can become very hot and make these wires very brittle.  i don't know exactly the wiring, but i will guide you in a direction that will give you a better answer.  go to www.300zxclub.com and sign up (free membership) and do a little searching.  its a great z site, i myself am a member and hopefully a future z32 owner.  enjoy your car, they are beautiful.  thanks for the question and good luck.