Help, all of my rear lights don't work when the light switch is set to parking lights, or head lights. That means that the rear isn't getting the illumination signal from the switch. The brake lights work when you press the pedal, and work when the light switch is on, but don't illuminate, as well as the spoiler light, and the license plate lights. So pretty much regular braking lights work when pressed but don't illuminate when depressed.

Is there a relay or something that feeds the rear lights the illumination signal?

Do your dash lights work?

Yes all other lights work.Just the rear lights, including rear side markers

check your grounds..and fuses..

where is the ground for the rear lights?

I fixed it, I ran a new wire and tapped into the illumination signal at the switch. Everything works as it should.