No Brake,hazard,or Turn Signals

[Chris1973]

I have a 2004 Mustang GT that had after market sequintal lights the box behind the left taillight went bad so I took it off and plug the wires back together and turned the left signal worked. Then I started the car and tried the turn signals and neither worked checked all the fuses under the dash all are good. Then I checked the hazards not working and no brake lights can someone tell me how to fix this problem please. Thank you

 

[manicmechanic007]

it may be a turn signal switch issue. the brake lamps go thru the t/s switch. and if it has no hazards either the switch has probably become unplugged. or a broken wire or pulled out of the connector. common on tilt wheels

 

[wmburns]

Just wondering. Does the high mounted 3rd brake light work?

Where to go next depends upon the answer.