This is for all you guys that have upgraded you're battery cables like i'm in the process of doing now.My question is is it necessary to retain the original ground(from batt. to engine)when grounding straight to the chassis?Or is it better to retain it and run a "double ground"?I did a search and could'nt find the info I need.I also read the tech right up on alternator wire upgrade but am not too sure if I need to keep the original ground from battery to engine.