Maybe a different approach

[SGTJAC]

First thing, The white on the Battery terminals is a protector not corrosion.
I'm hoping that this forum stays active as I and other new owners to come with have questions for a while. Many of you have been there and done it.

I have a 2006 GS Tour master without manuals but are downloading them as I find a new one. I have been starting the coach weekly but was gone for a 15 days and came back and all I got was a slow turnover and then nothing when I tried starting the engine. It was 60 degrees outside. I have also went and bought a large charger for future use.batteriesjan2020 (2).jpg

Next I started the Gen. and she came on right away without problems. Now, did I do something wrong by first trying to push the Temp. connect battery switch to start to diesel engine? (To no avail, very slow turnover and then I stopped trying) Also when I did try and start the engine, the Gen. died immediately. The chassis batteries are the top one's. The house the lower I believe and up front are 4 for the Gen.

Not very good with Electrical but will learn. Can you help with what I have tried to describe?