Tom,
Quick "Thanks" to you for recommended the Battery Tenders. My truck sits in the garage 29 out of 30 days per month. I purchased two of the Battery Tender Plus' for my Ram (one for each battery). I could have used one with a patch cable, but once I calculated the cost of the patch cable and extra eye-let connectors, it was only $20.00 more to get a second unit.
I hooked the eye-let connectors to each battery. I also bought the 12' extensions and zip tied them where the two plugs are next to the block heater plug. Hooked them up and they work great. Solid green LEDs ...
Thanks again. Craig C.