So I recently bought a house, it was built in the 80s and the previous owner had installed X10 switches (before X10 was a thing, when it was called DHC or Decora Home Controls). Anyway, the garage has a circuit which controls two fluorescent light ballasts; one switch by the interior-to-garage door and one switch by the exterior-to-garage door. The interior-to-garage door switch box has six wires coming out of it!
I pulled the switch out away from the wall and unplugged all the wires. I used a touchless probe to determine which one was the HOT, and I used my DMM in continuity mode to determine which ones were the Travelers based on continuity checks with the switch box wires across the garage.
I have two standard 3-way switches that I want to hook up to these boxes but I cannot figure it out. I'm not sure what the 'A', 'B', and 'C' lines are nor what to do with them.
Can someone help me determine how to hook up the 3-way so both switches can control both garage light ballasts?
Because I need to use the light in my garage, I currently have a standard 2-way switch installed in the interior-to-door switchbox with the 'B' wire tied to the neutral bundle and the switch connects/disconnects the wires labeled Hot and 'A'. However, this doesn't work perfectly because it only illuminates one of the two ballasts.
Trying to understand more about it, I tried flipping the 'A' and 'B' in my standard 2-way switch hookup but it still only lights up one ballast and it's the same one. I'm really confused at how to get this working again.