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Check all of your grounds. One of my cab to chassis grounds rotted right off, the one under the passenger side on an '02 crew cab. That caused all sorts of strange issues/codes and miscommunication. I also changed my starter after 167k, I believe it was the second one. The old one was physically...

Testing your GPR is pretty easy with just a test light as it's right on top of the motor. The WTS light will still "work" even with a bad GPR. Also, I'd bet a dollar to donuts that you're block heater cord is bad. Also pretty easy to test with a multi-meter. It plugs in right above your oil...

With matching batteries you should be able to put a tender on just one and have it keep both of them up. I believe the two bank tenders are meant for two separate (disconnected) battery banks? I use this https://www.amazon.com/gp/product/B0000AXTUY/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 one...