I will go into as much Detail as possible,

My truck: 1999 Ford F-250 Super Duty 4x4, 7.3L Diesel XLT 180xxx miles


Randomly all my orange running lights, tail lights and my dash lights quit working.

All my instruments on my dash are working (Speedometer, oil, fuel, Rpm,) however the lights dont work. The small lights work ( cruise, emergency brake, blinkers, hazard lights)

The tail lights are not coming on

The running lights do not come on

the headlights DO WORK and blinkers DO WORK and the Brake lights DO WORK

I have checked the Fuses under the dash and they all seem to be good.
I have changed the Head light and dimmer switch and that did not fix the problems.

I am baffled, I do not know what else to do.

Someone please help!!

 

Check your wiring to your trailer light plug. I had a similar problem on a '99 F-350. I checked everything as you did and ended up replacing the wiring and plug on the bumper and in the bed for the gooseneck hookup. Look for rusty/corroded wires around the spare tire or rust on the pins of your trailer light hookup.

 

I will check right after work.
Would that also cause the Dash lights to not work?

Thanks,
Zack

 

check for a blown fuse, the dash lights are supposed to go out when a fuse blows for the tail lights

 

I checked all the fuses under the dash and they are all good. Is there anywhere else fuses could be located? Could it be a Relay or somthing?

 

how did you check the fuses? Just looking doesn't always work, i have had fuses that look fine but are blown

i use a test light to verify when i have weird issues. just check both sides of the fuses for power to see what is failing

 

I have tested them with a test light but I will check again.

 

There is a set of relays (sometimes unused) located under your hood, on the drivers side that you might want to check as well. I believe one of them has something to do with trailer lights. If there is a short somewhere, it may effect your dash lights and tail lights. When I rewired my truck, my dash and tail lights worked again.

 

I checked the relays and couldn't fine anything wrong... i might just suck it up and take it to a shop... ):

 

There is Another fuse box under the hood. In the driver's side corner next to brake reservoir. They are lighting related (for trailer).

 

Here is a PDF File that I put together for you. You will have to download it to view it. I hope this helps.

 

Can't view file, having same trouble.

 

I had the same problem but my fuse was blowing and i found out tit was the headlight dash dimmer switch next to the steering wheel on the dash. Our manual tells us the location of the fuse but i cant remember check your manual to see what fuse powers those lights and it will more than likley be blown. Its one of the fuses under the hood so dont even worry about the ones in the dash. Good luck.

 

Again make sure you check under the hood im 100% its located under there. If you already replaced the headlight switch that turns them on and off once you replace that fuse you should be good to go. If the fuse blows again then you have a short somewhere else like the trailer light plug wires.