electrical issues with water pump.. need help...

Howdy all, just need some guidance on where an electrical issue could be. I will try to list all the details..

to start, I have a 2009 Thor Vortex Toy Hauler.. hooked up to a dedicated 50amp circuit, this may or may not be relevant.

A few weeks ago after being away for a week, we came home and turned the water pump back on, on the panel. it ran for a minute and pressurized. toilet was used a few times.. etc. about 20 minutes later I tried to fill a water bottle and noticed the pump didnt turn on. checked the fuse on the main panel and the fuse had blown. replaced it.. turned the water pump back on.. fuse blew again.

I took the pump apart and cleaned it.. didnt seem to be any blockage. replaced the fuse again after putting pump hoses back on. fuse blew again.

read a post on here about taking the pump part off and just hooking the motor up. again same outcome, fuse blew.

bought a new pump.. hooked it up and was feeling confident.. fuse blew again...

took the pump out completely so it was just wires with wire nuts.
fuse blew again..

I have used alot of fuses at this point.

I have also used a new switch and gotten the same result.

at this point, I assume its a short somewhere. I dont know what else it could be. anyone have any thoughts?

I have visually traced the wire under the RV and I dont see any kind of frayed wires or squirrel damage.

everything else on the panel works.. lights, fuel gauge.. water heater..

any help or suggestions would be appreciated.

Thanks
Chuck