The previous owner of my truck installed a battery isolator (Noco 140A) along with dual batteries. Well I've been having issues with the batteries going dead and the battery voltage guage reads low while the truck is running. I had the alternator and batteries tested. The Alternator passed and the batteries said good but needed charging. I charged the batteries but they still are going dead. I'm not sure if everything is setup properly. Is there anyone that help me? I'm tired of using the jump box.