I have a 06 silverado 1500 420 amp alt 0 gauge wire sencondary battery running skar rp 150.4 an skv2 3500 with a single 12zvx I properly tuned it voltage at alt is 14.7 at amp is 13.7 an when ran is steady with the drop can't figure out why I amp loosing a full volt plus alternater wire is...