Well this chump is stumped. 97 Suburban, 6.5L, 327K original engine and tranny. Quite often after traveling especially at about the 2 week mark I will return to crank the old Suburban and the batteries will be nearly dead. I have no clue what is killing the batteries which are Duralast Gold about a year old. I can close up the truck, disconnect the ground on one battery then check with a meter and have no current draw. Anybody else experience this? If so watcha find?