I bet you got a harness for a regular Camaro (even though it said it would work with the ZL1). You need to get the harness from gen5diy. Here is the link ot the correct harness -
http://www.gen5diy.com/PnP_harnesses...1-drl-harness/
The cheap harness doesnt have the wire to make the fog lights on a ZL1 work. Give them a call, they will hook you up!