Ok Guys, I Replaced The Headlight Switch and Everything Worked Great for Two Days. Now, when the lights are on, the brake and blinkers work but not the running lights !!!
If the dash lights work then it would seem you have a bad connection to the running lights. If the dash lights also don’t work then you might check the fuse for that circuit. Verify it has power getting to it along with making sure that the fuse is good.
Are all four running (parking) lights not working or just the rears?
Just the rear lights…
Are you certain the rear sockets are grounded? It sure sounds like you still have a poor ground condition.
If the sockets had a grounding problem the brake/turn signals wouldn’t work either. Sounds like a wiring or connector problem.
When the ground is lost the brake lights will ground though the parking light circuit as long as the headlights/parking lights are off.
True, but the brightness would be reduced due to the much higher resistance of the parking light filament. The two would be in series.
A question for the OP - when you step on the brake or use the turn signal do you see both the brake and parking light filament glow? You’ll have to pull the socket to get a good look.