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I have an existing 4-way not working but supposedly did at one time. There is a 2-wire line going out to the light and a 3-wire line going on to the next switch. The white of the 2-wire goes from circuit panel to 2-wire going to light. The black from circuit goes to switch. Red and white of 3-wire go from switch on to next switch and the black from the 3-wire is wire nutted to black of 2-wire going to light. Bottom line, first switch must be on for other switches to work -- it doesn't stay hot. Any help?
 

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Which box does the 2 wire line from the panel go to?

How many switches are there?
 

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That's only one switch of the set. The switch you are describing should be a three way not a four way.
In that box every thing sounds correct IF the black wire from the panel goes to the COMMON screw of the switch. The common screw will be black in colour or marked common.
If it still doesn't work then the switch is bad or the problem is at one of the other switches.
 
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