I'm replacing the pull chain switch from my ceiling fan. The colors it has are blue, red and two black wires. My replacement switch call for a orange , yellow, purple and a black wire. How do I determine which wire goes into the numbers 1,2,3 and L? My ceiling fan does have a light which work perfectly
I do not know the brand name of my fan.

You can only verify by testing different combinations. Black is almost always common.