Parking lights and side marker lights stay on constantly

[hotrodsinner]

Hoping I can get some help. I have a 71 c10, both my front and rear parking lights and side marker lights stay on constantly. With truck on, truck off, Key out, headlights on or off. No matter what. Just started recently. The only thinks I have done yo it since this issue started was cut out an old trailer light socket that was spliced into the wiring at rear tailights. Also I changed the steering wheel on truck. It has a new light switch. I checked fuses. What would cause this? A bad ground? A hot wire?