My old ceiling fan switch used black, red, green (ground) no white. Built after 2004 white was in outlet box, 4 white wires but all together in single cap - not used. New wall mount switch has separate fan on/off, and light on/off - wires are black, red green ( ground) and white ( assume neutral). There is an adjacent wall light switch in the box that uses black, red, green - no white. So, I am guessing I need to access the whites for my new fan. When I first wired I capped one of the 4 whites to my new switch - the other light switch would not power on . I put the borrowed white back to the 4 wires capped together and the second switch worked. I am unable to test the fan until I wire the new fan from ceiling. I would like to make sure the wall switch is functioning before I get the ceiling fan wired in place.

So, how do I wire the new switch with the existing scenario ? which of the 4 bundled white wires do I use, or do I wire my white wire from the new switch to the 4 bundled white wires? Please Help!

My old ceiling fan switch used black, red, green (ground) no white. Built after 2004 white was in outlet box, 4 white wires but all together in single cap - not used. New wall mount switch has separate fan on/off, and light on/off - wires are black, red green ( ground) and white ( assume neutral). There is an adjacent wall light switch in the box that uses black, red, green - no white. So, I am guessing I need to access the whites for my new fan. When I first wired I capped one of the 4 whites to my new switch - the other light switch would not power on . I put the borrowed white back to the 4 wires capped together and the second switch worked. I am unable to test the fan until I wire the new fan from ceiling. I would like to make sure the wall switch is functioning before I get the ceiling fan wired in place.

So, how do I wire the new switch with the existing scenario ? Which of the 4 bundled white wires do I use, or do I wire my white wire from the new switch to the 4 bundled white wires? Please Help!