2002 ford mustang coup. My signal lights don't work at all. We replaced all the lights and replaced both relays. No trouble with flashers. Any suggestions what else it could be?

You will need to remove the rear lens and the brake bulb, put a tester on and have someone step on the brake to see if you have power. If no power the you have a short going back to the relay.

OK will try. Thanks for suggestion.

If it was a bulb, or relay, the other side would flash twice as fast, to let you know, there's something wrong!!! It has to be a wire broke,or a bad connection in the wiring system....hope this helps