I have been trying for a week now to get my swapped engine to start. When I turn the key on, the positive post on t hebattery gets very hot, and the starter will not even begin to turn over. All I hear is an initial hollow clunking sound from near the starter relay, then nothing but a hot battery post. I have had the starter and alternator tested and they passed with flying colors. I have rechecked the wiring from the alternator to the regulator, installed a new starter relay, and have a fully charged battery. Yet I still get no cranking at all. What else can I do?