Nearly what feels like the end of electrical in the garage before moving to hangar and adding wings, tail etc. So short of wing and tail lighting, and roll servo being attached things are feeling dern near finished. Until a day or three back, as I was doing the various harness's, aircraft rear, front, flap and trim, AP servo, and control sticks. As each harness was added things started to come to life. Now, when I turn the master switch on, switch lights do not illuminate, flap motor does not work, it shows ahars offline, warning message "Electrical elec comm", ap panel offline, radios power up but show nothing. It feels like I crossed wires somewhere or a loose connection, the ACM seems suspect somehow ? Ive looked for anything obvious, but at a bit of a loss about how to troubleshoot the issue. First time posting here, seemed like a good choice. Suggestions ?