Switch will have a commom terminal that the hot wire connects to. The other three terminals are for the devices -- light, fan and other device.
The white wires should be the grounded wire returns for the circuits unless they are identified by color tape to be hot line side of power.
Be careful of the grounded side of circuit, can shock or kill, treat all wires as being energised. If you are not sure, use a electrical tester, or get help.
Answers & Comments
Switch will have a commom terminal that the hot wire connects to.
The other three terminals are for the devices -- light, fan and other device.
The white wires should be the grounded wire returns for the circuits unless they are identified by color tape to be hot line side of power.
Be careful of the grounded side of circuit, can shock or kill, treat all wires as being energised. If you are not sure, use a electrical tester,
or get help.