I have a hamilton bay fan/light the pull switch fell apart so I bought another one but don't know where the wires go I have a black, purple, orange and yellow wire and have l 1 2 3 on the back of the switch

You can try

L - Orange, 1 - Black, 2 - Yellow, 3 - Purple

Ceiling fan pull chain replacement and repair - Ceiling Fans N More (http://www.ceiling-fans-n-more.com/ceiling-fan-pullchain-replacement-and-repair.php)