Great info on disconnect and hook up. I am trying to find info on proper maintenance charging for my 04 6 liter with dual battery's. I have Battery Tenders on my Bayliner, Yamaha ATV, Harley, and Kubota. I bought a dual port Battery Tender and thought I might as well put on the truck, but dont know enough about how they are wired, or which one to hook up to. Are there any previous post on the subject or wiring diagrams so I can see how the battery's are tied together? The batterys are good, I just am not using the truck much this time of year. Thank in advance for any help.