Re: 3 way light switch - light inop
Although the routing may be different all 3-way switches are wired like this
On the common of the one switch (1 in the drawing) there is always power, that power always feeds through the switch to one of the two travelers as the switch is flipped the power goes to the other traveler. The two travelers go to the second switch. One of the travelers is always powered. Which one depends on the position of switch 1. Switch two's common connects to the light. flipping switch two changes the connection of the common from traveler 1 to traveler 2. Neutral is always connected directly to the other side of the light.
I hope that helps with your trouble shooting. Two things to remember 1] not all 3-way switches have the common and travelers in the same position on the switches so you need to check the marking and 2] sometimes the problem is a loss of neutral rather than power.
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