(we are getting there,
I opend the ballast and the black whire that is coming out is conected to the switch.)
This wire is 120v power supply from the wall plug for the ballast through the switch
let me know how many wires let over without connected to anything and all of their color
There are two terminals on the switch. incoming terminal is for the hot black wire of wall power supply plug. So there is only one black wire on it. The other terminal is for outgoing wires. Usually, there are two black wires hooked to this terminal, one go to the ballast, one go out of the box heading the fixture(without going to anywhere elf) for fan adapter...
By doing this, the whole fixture and ballast will be cut off power when the switch is turned to off position.
The box is designed to work with led, fan and light system. In your case, you can cut it off or save it as internal power supply later for later use...
Turn you Volt meter to 500v post then measure the black wire against the white. steady 120v is the one. Make sure to turn the switch to ON
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