I recently put on a pair of projection lights on my 94 mustang convertible lx. The lights came with a wiring harness that bye passes the stock headlight harness. My car didn't have fog lights on it soI bought a pair being as the car had the had the plugs for them. I plugged the bulb in and they didnt work. I was told that the fog light harness was wired into the stock headlight harness. My car doesnt have a separate fog light switch. How can I fix this problem?