Hi All, I am hoping someone can help me with my Skyline GT250 2005. I had a flat battery failure and tried to jump start but failed because probably battery had died. I then connected another spare battery but mistakenly connected the wires incorrectly. Since then, it seems the electrical system is not working at all. Headlights, Immobiliser, Ignition nothing works. I called Racv and they replaced the battery thinking the battery was really flat but no luck. Can anyone please help me how I can fix it? Thanks