Tripac any info would be helpful

[Chamberpains]

   
The truck I just bought came with a Tripac system. I doesn't run and I'm trying to troubleshoot what all is wrong with it. I know nothing about these things. So any info would be helpful. Like what model am I dealing with. Where can I get technicians level diagnostic stuff (including software and interface if it has any)

This thing is said to still be functioning with some component failure. Im finding they disconnected a bunch of wiring and sensors but everything looks like its where it should be.

So far I've found the control panel in the bunk doesn't light up. The 2 amp fuse has a strange problem. With the fuse pulled out, I have 7v or so on 1 post. Once the fuse is put back in, I lose voltage to either side of these fuse. Im gonna assume its either a relay bad or the control panel is bad. But I have know idea. Im literally just figuring it all out piece by piece with the operators Manual.