Your wall plate should have a power source cable, your ceiling light & fan cable, and lastly your vanity lights. All this cables should be Black, White with a Ground wire. If you have a cable with a Red wire put that one to the side for now (likely your fan unit) we’ll deal with it at the end. If you have more cables these likely serve your other lights and outlets in the basement. This is were you need to stop as you likely have to much load on the circuit. Bathrooms always should have their own circuit and also need GFI breaker and outlets. Your basement outlets likely need a AFCI breaker. This is at a point you need a licensed electrician to install a new line to your bathroom and rewire the basement service so the line is not present in your switch plate gang
You’ll need to use your volt meter or voltage detector probe to identify your power source cable. I would recommend you get some colored electricians tape so you can mark it with color (Yellow). Now carefully tie all of the neutral wires together (While) cap and tape the wires so nothing is exposed. Now with the power feed Black wire isolated so it doesn’t short out carefully touch one black wire to it so you can identify what its powering. WARNING! Use extreme care with the live wires as you don’t want to get a shock! Once you know what each cable does mark it with a different color tape and make note each colors function.
Now lets talk about that cable that has the red wire, now that you have identified all of the other lines this should be your ceiling fan. The fan and the light are likely setup so you can use each independently from each other. So you will need to test the Black & Red wires like we did the back wires one wire will turn on the fan and the other will turn on the light. I wired up my fan with a timer so set it and walk away without having to worry to turn it off.
Depending on how may switches you have and if you are using a high density switch unit you might consider placing the ceiling light and fan control outside of the bathroom saving the space in the other box gang for an outlet or night light.
Now your switches need to be laid out in the order you plan to put them into the box. with the breaker turned off wire up the black lines to the switches keeping them on the same side (top or bottom). You’ll need a black wire tail to mount on the other side of each switch. Carefully strip off the excess wire on the tails so you can tie them together and take the source Black wire bind it to the other black wires. Mounting the switches is all there’s left.
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