Help! Lift Gate stopped working

First of all thanks for the forum. I hope I'm posting this in the right section.

Truck is a 1995 International 4700 box truck w/ a Walco 3,000lb railgate.

I've been storing this truck for a buddy of mine for a couple months and decided last week to rob one of the batteries out of it for my Ford. Anyway, upon re-installing the battery this morning I accidentally arced my wrench across the battery box for a second. A few sparks, didn't seem like a big deal.

Got everything hooked up tight on the battery terminals but the dang lift gate switches don't seem to be getting any power. Everything else works fine. This truck has never had anything wrong with it like this before.

I'm thinking I may have blown a fuse somewhere but even if I could tell what these particular fuses look like blown I have no idea which fuse I need to be finding... or if shorting out a battery like I did can short circuit a specific component, like the lift gate in the first place.

I just made a profile on here to seek help for this specific issue so I really hope someone can point me in the right direction!

Bottom line - The buttons that raise and lower the railgate aren't working and I can't locate the correct fuse to check.

Thanks in advance.

 

Yep, down to the cargo lights.

 

I've got 12V at these circled contacts.

 

I traced the main jacketed lead from the pump at the back of the truck all the way to the battery box where it goes through a high amp bus (not sure what this is). So, from the pump to the battery box there are no visible inline fuses, other than inside the battery box where it goes through the bus to the hot terminal.

 

Here it is. 373B.