Not getting power from new RV battery :(

We will check to see if we have a disconnect switch. We checked the two larger fuses(next to the switches; had 40 on them) visually but will do a more in depth. The little fuse checker that came with some of our old fuses didn't light up on any of the fuses and we think they are all good (all the little metal inners are not broken).The cables are connected correctly now; not sure if they were when DH first hooked them up. Will definitely replace the Reverse polarity Fuses. We checked and the ground wire is tight to the frame. Yes we have a voltmeter and use it. Not on our trip to Fort Wilderness a week ago, but we noticed the problem before leaving home and replaced the battery and issue continued. At fort wilderness, we had an issue with city water not flowing into TT or water pump coming on. DH unplugged water heater and pressed the reset button for the water heater? and plugged it back and that seemed to correct the water issue. Our TT had been plugged to our house for months while stored in the backyard. Our portable Surge Guard was not attached while plugged in at home.

Hope these additional details help.

Thanks all,
Delores