When I went to test the alternator, I put my tester (volt meter) on one of the electrodes on the back of the alternator (batt terminal) and it sparked! Then the motor bogged down a little then I pulled it off, does this present a bad ground or something else? Or is this normal? The battery while running is showing 13.5 and 14 volts, stock coil is about 3.75 to 4.25 volts while running. Thanks, Jay