I know bathroom outlets must be on their own circuit. Can the bathroom lights be on the same circuit as say the bedroom and hall lights?
Electrical – Can bathroom lights be on same circuit as bedroom lights
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My approach (not an electrician, just a guy with a meter) would be to start by mapping the circuit (find all of the outlets and fixtures that are on it), then unplugging EVERYTHING that's plugged into that circuit and see if that has an effect.
Next up, I'd kill the breaker and open up the switches and take a look. See if there's evidence of burning or arcing, or if one switch feels different than the other. I'd probably disconnect both switches (safely capping all wires), then turn the breaker back on and verify (using a meter) that the voltage is reasonable at all the outlets and other fixtures, and see what happens in the bedroom.
Basically if that tells you nothing, then I'd either start pulling outlets and fixtures off the circuit (kill breaker, remove outlet, capping wires, breaker back on) until I figured out what the heck was wrong, OR I'd just call an electrician.
Yes, you can run a new cable directly from the panel to a junction box and split it there. Getting the new cable to that box might be a problem, but you can figure that out.
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Best Answer
Yes. There's nothing different about bathroom lights vs bedroom lights. In fact, I would say it's a bad idea to tie the bathroom lights to the bathroom outlet (which should be a GFCI). Otherwise you drop your hair dryer and suddenly you're in the dark!
The only thing you might need to consider is that bathrooms tend to have exhaust fans on the same circuit as the lights. These tend to draw more amps than a light, so make sure you don't overload your circuit.