The two 4-ways are located between the two 3-ways and the traveler wires run from SW1 to T1 on the first 4-way. T2 from that switch is wired to T1 on the second 4way and the output from there to the traveler terminals on SW2.
Here two switches are wired in the same box to control two separate lights. The source is at the switch box and a 2-conductor cable is run to each light. One source is spliced to each switch with a pigtail to power the two lights.
If your switches stop working they may be worn out or the screws may have come loose. If you’ve wired a new switch correctly and the circuit still doesn’t work, the switch may be defective. Check that all connections are tight. Check the switch, remove it from the circuit and test for failure with a continuity tester or multimeter set on the Ohms setting.
This is another option for wiring a combo device where two sources are used. In this arrangement the connecting tab between the hot terminals on the device is broken off to separate the two. The switch controls a light and the receptacle half of the combo device is always hot.
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