Step-by-Step Guide to Fan Light Wiring. When it comes to installing a new fan light or replacing an existing one, understanding the wiring process is crucial. A fan light wiring diagram can help you visualize the steps involved and ensure that you connect the wires correctly. Here is a step-by-step guide to fan light wiring: 1. Safety First.. I am replacing my bathroom vent that has a fan, heater, light and night light with a new very quiet Broan unit that does the same things. The switch has 2 toggle switches. One for fan and heat neutral position in the middle. The other toggle controls the light and night light. I removed the old unit which had 5 wires coming from the unit.
Based on the wiring diagram, if you connect the fan and night light to the same incoming (always hot) line, the night light will be on 24/7 and the fan will be controlled by the occupancy sensor. This likely isn't a bad thing, but not sure it's what you want. The wiring diagram doesn't show any way to connect the night light to the occupancy.. The fan/light combo is intended to be controlled by three switches, however this isn't entirely necessary. The easiest way to deal with this without running any additional wires would be to wire nut together the fan and the light to the black lead from the switch and then just wire nut together the neutral.