AC Delco poor customer service and poor dealer service Internet!!. Had our 07 Chev 2500 silverado diesel towed to Merle Stone Chev. dealership with dead batteries. After one day of testing, they said it was fine and that we must of left the lights on. Went to pick it up the next day. Batteries were dead! Without any apologies, they took it back in and replaced one of the two batteries with the top of the line AC Delco. They said it was OK. Had the other battery checked by an independent shop the next day. It was crap too! Took it back to the dealer and talked to the owner about his service dept. They gave us a price break on another AC Delco battery. I now have two brand new top of the line AC Delco batteres with 7 year warranties. Within a year, both are crap. I try to get AC Delco customer service to warranty them. They said they need to be checked out at the dealer. Like hell I’m going back to that place. Went to another GM dealer who conformed that both batteries were crap and that there was nothing wrong with the truck. Cost me almost $100 to have the two batteries replaced under warranty. AC Delco could care less about my out of pocket expenses due to their failed product. I will never by an AC Delco product for my vehicles.