I screwed up. Wanted to see why my garage opener light wasn't working. Saw what I thought was a broken white wire, reattached it where I thought it should go - Nothing works with it in or out.

Genie GR390-12 receiver with 3 wires attached to old Moore O Matic Sioux 72 1/3hp.

Plug in wall has 2 wires (red/white) coming out of it. White one was not attached (I think it was?)

Genie receiver has red spliced to the above red wire with tape over them.

Genie's black and white are attached fine.

I can't find any instructions/manuals on anything. What do I do with this white wire (if anything). I just can't figure out why this all stopped working as soon as I take off the plastic lid (basically) Thanks