In my case there was never a voltage difference between the batteries, and the resistance all around was within spec too. It was all monitored with a Fluke 3000 wireless multimeter (amazing product BTW). One of the first steps I took was to clean the connections, but clearly I didn't do a good enough job! I followed the troubleshooting guide step by step which is why I replaced parts. Only after a bunch of head scratching did I go back and remove and clean every possible connection under the hood, including all the grounds. I am not sure which connection is particular was the culprit, but I did learn that corrosion really can be a gremlin!

 

Thanks, I agree with you too! Although his intent is good, Steve really knows how to drive a thread off a cliff! Take this (parsed) quote below:

Wow really, in the same paragraph you say you can't add value without data, and then you attempt to do just that by offering some needless/basic advice and calling it valuable.