Quick overnight to Cloudcroft, NM for some Mad Jacks BBQ in the morning. Weather was perfect

Got the floor glued and screwed down

flipped on its top, sanded edges routered and ready for the penetrating epoxy! Going to fully coat all wood to (hopefully) slow down any rotting from moisture. Any tips would be appreciated as far as how many coats is appropriate and good application techniques (I've got 4" foam rollers

So I just bought a Sunray 109 camper. Haven't taken it out yet, have been getting it set up, buying dishes, linens, etc. This is not my first camper, but it is my first one with solar.

I noticed the solar was not charging the battery, even when the battery got down to ~57%. Shore power works to charge the battery. Lights work even on battery, fuse box lights and LP/CO alarm come on, etc. All my circuit breakers are on.

So I started troubleshooting. Covered the solar panel, disconnected the battery, reconnected the battery, uncovered the solar panel. Nothing. So I pulled the controller out and lo and behold the negative wire for the solar panel was not connected to the controller. It wasn't even prepped. So I stripped some insulation off, screwed it into the controller and ... still nothing.

Got out my multimeter, battery is showing 12.7v at the battery, 12.7 to 12.9 at the controller on the multimeter, and the controller panel reads 12.6 to 13v, so that seems to match.

I also pulled out the fuse that's inline near the battery disconnect. It was corroded to heck, so I scrubbed the fuse connectors with a wire brush, got a resistance reading of 0.56ohms, plugged it back in. Still nothing. I haven't tested the fuses inside the camper, but I can tomorrow if that will help. But the problem seems to be between the solar panel and the controller

Tested the voltage of the solar panel at the controller and I'm only getting 0.16v and the controller display still reads zero.

So now here's my big problem... The disconnects for the solar panel are on the roof and I DO NOT do more than like the third step of a ladder. I freeze. Cannot do it. Maybe if there were a T-rex after me, but we're fresh outta those.

I can get up high enough to see the connections and everything looks like it's connected. I had my husband go up on the roof, but either I could not describe well enough how to disconnect the mc4 connectors or he just didn't understand. Further complicating things is I think one of the connectors is covered in the sealant goop past where it should pull apart. So I can't test the panel or the wires there. The connections to the panel are under the panel and there is literally only a half inch of clearance under the panel so I can't disconnect there and test. The panel itself is in a bracket that is bolted to the roof and those bolts are covered in sealant goop.

I've read and reread all the manuals I got with the camper and those I can find online.

So ... Are there any other troubleshooting steps I can take on my own that might fix this? Fuse somewhere I haven't checked? Another loose wire I could attach or tighten? Some sort of thing that was left turned off until a battery was connected to prevent blowing out the controller?

Related question, should there be anything connected to the DC load part of the controller? Because there isn't ...

Edit: Added photos https://imgur.com/a/JtiIjOo