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The first thing I would check is to be sure you wired up the batteries correctly AND didn't drop a cable down and out of sight that you didn't get hooked up...........usually a ground lead. The best way to check the batteries IF you didn't take a photo of the cables, would be to check the OUTPUT DC voltage where you have the leads coming OUT to the coach. You would want to see 12.8 VDC there or close. Same on the leads coming OFF the start batteries. You always have to reset the battery disconnect switches when you remove power. Hit both of those as well and see if you hear the solenoids "click" and IF NOT, the battery wiring becomes more suspect. Let me know what you find and please describe what sizes you installed and how you hooked them up. It would be easy to get cables wrong on 8 batteries! I will be home soon and will watch for your post. R.J.
Do you have a small digital multimeter like you can find at most automotive or hardware stores? That would be most helpful here for some testing.