looking for some help with an old Rheem 1005 HVAC system. I’ve scoured the Internet for days, so this is a last ditch effort at self-help. I’m installing an ecobee to an existing 4-wire system that had a 5th C-wire already available at the thermostat. The thermostat is hooked up completely but I don’t know if the c-wire is connected at the other end in my HVAC control board because if I turn the ecobee on, it just cycles over and over and Shorts out or something, then immediately kicks back on. The inside of this unit looks like nothing I’ve ever seen before.
I just need to know if that loose blue wire is my C-wire and if so, where can I connect it, or if I need to wire a new c-wire. Pictures are attached for reference.