Replace the fuse to a higher amp fuse. Like if the fuse is a 25amp, change it to a 35amp. This will most likely make the problem go away and will not hurt your system. I'd be willing to bet the new unit you bought and installed is rated for a higher amp.
If this does not work, then you will need to remove the lamps and check for a damaged wire or corrosion on the terminals.
you need to do a continuity check on the switch. its possible that even the replacement is bad as well.
Check the bulbs,if not the bulbs you most likely have a bad ground.
I suspect the switch is bad.
Check the fuse or switch.
I found this on my 1997 Silverado and found the connection from the wiring harness to the back OS the switch itself was loose, I could wigle it arouns and make the lights come back on.
Change out the switch. Bad switch!!
Check the fuses? Check the light switch?
Switch on brake pedal needs tightened replaced, or switch for lights needs tightened or replaced.
Replace turn signal switch. Its grounding when you put turn signals on. I had the same problem and replaced it .Solved issues.
could be bad wiring
check your switch inside the cab (the one you actually use to turn lights on and off). Mine did the same thing and the switch had shorted out...should be an easy fix
no, the switch in the steering column is bad and needs replaced.