The big 3 should upgrade the alt to batt wire, engine ground, and batt ground. Alt to batt is upgraded to allow current from the alt move more freely to the battery. Then battery ground is there for a better ground and the engine is, in fact, the alternator's ground. Youtube "the big 3 upgrade" and you've find plenty of vids on the topic. Whether you understand it or not, give it a try and check the results for yourself.