volt light would not come on unless i plug these 2 together . friends have told me not to plug them but then the charging system will not work . can i leave them plugged and will it harm anything ?
The green connector I beleive is the tachometer signal and the black one energizes the fuel pump when you apply 12v to it. Not sure on the long term affects of leaving these 2 connected but what you really want is a field fix harness:
Those connectors have nothing to do with the charging system. As mentioned above the green connector is a tach test point and the black connector is to power the fuel pump. If you connect them together your tach won't work.