my alt has not been charging my battery, alt and battery are good. so i was trying to find some wiring issue and when i checked the green wire, the alt started charging. so if i touch a jumper to the green wire, it starts charging. i can remove the jumper and it continues to charge. if i turn off the car and restart, it no longer charges until i touch it with the jumper again. what would cause this? where does this green wire go?