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If he hot wires the light switch and they still don't work, it's a not a problem with the fuse or the wire coming from the fuse, that's why I didn't comment on that. I zeroed in on that and didn't answer the original question. Sorry.
have a 2002 7.3 are the wires the same for the lite switch also my dimer and light switch are seperate is there a relay under the hood all mt fuses under dash are good
Similar problem here, but I'm not experiencing the dash light failure related to the tan/white wiring.
It's just my taillights that aren't functioning.
There is a cluster of several harnesses at the back. If the dash is working, would those be the best place to start focusing on?
***2002 F250
You have one wire(brown) that spreads all over the truck front and rear to feed the running lights. If you have some that are working, and some that are not, then yes, focus on the area of the truck where they are not working. If some of them are working, then that means the headlight switch and all the associated wiring and fuses are good.
I was having this same problem with my 94 x sport. Changed switch, and harness. Now I have dash lights, tail lights and license lights but my front corner and parking lights don't work and my turn signals remain lit when parking lights are on. Everything works normal except for this. Under my fuse panel is the number 13 fuse and it's labeled in the manual as instrument illumination however there is no power to it. I'm stumped. Any ideas or suggestions?
parking lights don't work and my turn signals remain lit when parking lights are on.
You have a grounding problem in the front lights. Each light has 3 wires going to it. One is the turnsignal wire, one is the parking light wire, and the last wire is ground. This ground wire is not grounded properly and not connected properly to the negative of the battery. This will cause the problem you are describing.
Under my fuse panel is the number 13 fuse and it's labeled in the manual as instrument illumination however there is no power to it.
Turn the headlights on, and then check the fuse for power. This fuse get's power from the running light circuit. It will be dead unless the lights are on.
I tried testing the #13 with the switch pulled. I believe this is the light blue wire with red stripe hooked in the switch at "I" on the dimmer. I have power with the switch pulled at the switch but still nothing at the fuse box, so a bad ground would cause my corner and side marker lights to not work but my turn signals would stay solid unless I actually turned the turn signal on, then it blinks?
so a bad ground would cause my corner and side marker lights to not work but my turn signals would stay solid unless I actually turned the turn signal on, then it blinks?
Yes sir. The ground problem can be in the socket where the bulb contacts the socket, or it could be the ground wire itself. Sometimes the vehicles are in a accident and when the front end is replaced, grounds are forgotten.
Your other problem; Do your instrument lights work?
Yes the instrument lights are working however there is no power to that fuse in any position. The vehicle has never been in an accident. All of the lights worked prior to blowing the number 10 fuse. Replaced fuse and switch still was touchy so I started there and replaced that. Pigtail was a little burnt so replaced that as well. Once those things were replaced I got tail lights, license lights and my front turn signals stay solid and very bright but still blink when used. No side or corner lights in the front still.
Dave, I have a 2000 Excursion in which the brake lights randomly illuminate while parked. I just discovered that when I wiggle the stop lamp switch they flicker, and it seems to move quite a bit. Is there usually this much play in them? Should I go ahead and replace the switch since the wiring seems reasonably intact?
Dave, I have a 2000 Excursion in which the brake lights randomly illuminate while parked. I just discovered that when I wiggle the stop lamp switch they flicker, and it seems to move quite a bit. Is there usually this much play in them? Should I go ahead and replace the switch since the wiring seems reasonably intact?
I would replace the switch. If they are still using the switch that Ford has used since the 70's, it's a switch that rides on the pedal arm. In this style of switch they made a pin in the pedal arm that is undersized and sloppy in the hole of the brake booster rod. There is a spring in the switch also. When you push on the brake, the pin slides to one side of the hole in the brake booster rod, and when it does this to take the slop in the hole up, it pushes on the electrical part of the switch and turns the brake lights on. It's a weird setup, and I don't know if they kept using it in the later years or not. I know my 89 still uses it.
I would replace the switch. If they are still using the switch that Ford has used since the 70's, it's a switch that rides on the pedal arm. In this style of switch they made a pin in the pedal arm that is undersized and sloppy in the hole of the brake booster rod. There is a spring in the switch also. When you push on the brake, the pin slides to one side of the hole in the brake booster rod, and when it does this to take the slop in the hole up, it pushes on the electrical part of the switch and turns the brake lights on. It's a weird setup, and I don't know if they kept using it in the later years or not. I know my 89 still uses it.
It does use the switch that you described (I noticed it was a sloppy set up as well). Last night I disconnected the plug from the switch to try to save some battery life, and the stop lights kept illuminating! This only happens for about 2 seconds at a time, but very intermittently.
It is also worth noting that an aftermarket (and poorly installed) trailer tow system has been installed many years ago, but I can't find anything in their wiring that would just cause the lights to come on.
Any further thoughts? With it lighting up when that switch is disconnected, it makes me think that something is grounding out or maybe the trailer system is triggering the brake system?
Hello, i can across this thread, i just recently bought a 1989 f250 5.8l 4x4. and i pulled up to a buddies and he pointed out my tail lights weren't working. all the same symptoms as the earlier posts. and i checked and replaced almost all the fuses. then when i went to check to see if that fixed the problem my head light fuse went out. i replaced it, did the same thing. 2 or 3 times. now i have no head lights or tail lights. any idea what could have happened??
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