Both of the two wire "trunks" should have white and bare wires in addition to the black and/or red ALL the white wires in the box should be twisted into a bundle with a wire nut, and all bares should be twisted in a bundle with or without a nut.Connect the black to one of the remaining terminals other than the grounding terminal, and the red to the other terminal. One will be black, and the other red, and they should both be a part of the same "trunk" of Romex wire. The other two insulated wires you removed from the switch are the "traveler" wires.A picture's worth a thousand words see below. Looking at the body of a three-way switch, the common terminal is the terminal that has another terminal screw on the switch body facing the same way, but doesn't have a screw directly across the switch body facing the other way. Back at the box with the wire you identified as the panel hot, connect the hot wire to the "common" terminal of the 3-way switch for that box.Turn off the breaker at the panel again.The live wire is your panel hot remember it. You will find one loose black wire in one of the two boxes that is live, and all other wires should be dead. Probe all the wires you disconnected and separated one at a time with your non-contact voltage tester, being extremely careful not to touch any of the other wires with the tester or any part of you.From this moment until step 5, the second you are not extremely cautious around every bit of bare metal in that box, you will pay for it. Pull these wires out of the box and separate them so there is no bare copper touching any other metal. Disconnect all wires from both of the 3-way switches (but do not unwrap or un-nut any of the twisted wire bundles, or disassemble any other switches).Use a non-contact voltage tester to ensure all of the screws on the side of all the switches in both boxes are dead before pulling out any switches. You may also need to cut additional breakers if either or both of the 3-ways are in "multi-gang" boxes with other switches on different circuits. Turn off the breaker controlling this light.Here's a fail-safe process to fix a three way setup that isn't working: In many cases regarding electrical work he'd done, I had to go back in and clean up.
The original owner was a bit of a handyman and had done several small (and big) projects all over. I had this EXACT issue when I moved into my new (to me) house.
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