Finally have my 68 running ,one small problem the motor keeps running even when key is shut off.Running a Powermaster alt. w/ either 1 or 3 wire hook-up. Am using 3 wire w/ adapter for int. reg. also MSD 6al,dist.& coil. Have red wire from box connected to white wire from ignition using mini starter so yellow wire not used.When I turn key off gen. lite stays lit nothing smells hot all wires seem fine. Any ideas?