I am putting a delco-remy 10si three wire alternator on a1965 john deere 4020 positive ground so i bought a positive ground alternator i hooked the main lug to a volt gage and from that to the battery ihook the number one terminal (exctire) wire to the switch for the hot side of the coil and i hooked the number two terminal (sense) line to the battery this should be right but it does not seem to be charging the only thing i can thing of is the tractor engine rotates counter clockwise were is my truck rotates clockwise could that be the problem or does it mater which way it spins thank you