I was messing around with the brake pressure switch on the master cylinder reservoir, removed connector, read it out, replaced it. Now my parking brake light stays on. Any ideas. Fuse is ok.
Bill

 

gas or diesel? what year?

 

It's an 02 7.3 6 speed, CC. I got some bum scoop it would seem and now I'm paying for it. I should have stuck to the old saying, "If it's working fine, don't mess with it!" I also disconnected batteries, still no change. Took it for a test drive and the light went out for about 5 seconds then came back on. I have a extra brake light mounted in the trailer hitch receiver, now it comes on when lights are turned on.
Bill

 

Are you sure you reconnected it correctly? Not backwards? It would take some doing to do it, but I've seen worse. I'd remove what you did and go from there...CHECK EVERYTHING you did. It worked ok B4 you worked on it, but not AFTER. Best place to start.

 

I was wrong. It's not the brake pressure switch but rather the fluid level switch that I disconnected. All I did was disconnect it, read it out and reconnect it. Everything else works fine, just that darned red brake light on instrument panel will not go out.
Bill

 

I don't really know what you mean by "read it out", but make sure that you have enough fluid in the master cylinder. If the fluid is full, remove the cap, and using a clean screwdriver, push the float down inside the cylinder and then let it float up. If it seems stuck, rap the side of the reservoir with the screwdriver handle. As long as that float is up, your light should be off, unless the switch got screwed up when you disconnected it.


RON

 

I just checked for voltage at the plug with a multimeter. It had 11 vdc middle pin with key on. I didn't read or ohm out the switch.
Bill

 

There is no float in my reservoir?
Bill

 

Just bringing this to the top again. I still have a constant brake light, the red one. Everything else works fine except the brake light in the hitch receiver. It comes on with the light switch? My 02 doesn't have a GEM instead it has a VSM and instrument cluster system? The constant brake light is annoying. There are no code either.
Bill

 

Are you sure the parking brake isn't pushed down just one click? I have no clue about the hitch brake light. I think I would unplug it until you trace the other problem down.
Joe