Electrical Wiring in the Home/Wiring 4 way switch circuit


I have a 4 way switch circuit which controls lights over my garage entrance.

I replaced the 3 way at the start of the circuit.....the 4 way and the 3 way were untouched as they were.

The 3 way at the end of the circuit works fine, but the 4 way and the 3 way at the start of the circuit appear to be ineffective.

I obviously did not wire the first 3 way correctly.
Given that diagnosis, can you venture a guess as to what I did wrong,


If you only changed one of the three way switches, then the problem is there [unless gremlins have become involved]

There are several ways to wire a three way, but it always comes down to swapping a traveler with the common. The common will either have the hot feed or the load conductor on it. The travelers will be in one cable together. Unless you are at the remote end of the switch system with only a three wire in it it should be easy to figure out which is what.

Best regards
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Electrical Wiring in the Home

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Robert Wilber


Licensed Philadelphia electrician serving Delaware, Chester, Montgomery and Philadelphia County in Pennsylvania. I install and repair residential, commercial and industrial wiring and lighting. Troubleshooting and repair of problems that stump other people is my favorite. I am willing to help people figure out why things don`t work. I understand motor controls, transformers and machine wiring. I do not teach basics to novices or do free design work.


Experience in the area I have 44 years experience in residential, commercial and industrial electrical construction and repair, 480 volts and below. This is not to be confused with one week repeated two thousand times.

44 years experience in residential, commercial and industrial electrical construction and repair

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