My work truck is an 03 F250 5.3L. My flashers recently stopped working. I turn them on, and they will work anywhere from 5 seconds to a few minutes, then either blink rapidly and shut off, stay solid for a few seconds and shut off, or just shut off. I push the switch off and on again, and the cycle repeats. All my other lights and turn signals work fine with no issues. This wouldn't be a huge issue, but where I work I need the flashers a lot. The truck has a bar light and siren/pa system wired into it, but not to the lights or anywhere near that. I can't say exactly how it's wired because I didn't install it, but I followed the wires and they don't go under the steering wheel where I would assume the relay and wires for flashers would be.

What sounds like is wrong? I wouldn't think it would be the relay because then I would think that I would be having problems with more than just the flashers. So I'm not sure if there would just be a ground issue or if it's the actual switch that turns on the hazards. Also, there are no lights that are burnt out.

 

You are talking about your hazard lights correct? Your turnsignals work ok? If so, I suspect there is something wrong with the multi-function switch(what Ford calls the turnsignal switch now).

The turnsignal flasher relay is common to both the turnsignals and the hazard lights.

You can also tilt the wheel up and down and see if that affects the operation of the lights, but I would think you would have problems with the turnsignals also if a wirng plug was loose in the column, and tiliting the wheel puts a strain on the wires.

 

I do not have a tilt wheel so I can't do that. And yes I am talking about my four way flashers. I have full operation of every other light including the turn signals.

 

The only thing left is the switch. Everything else is common with the turnsignals.

 

I won't be back to work for a few days, but I guess I'll take the dash panels off and remove the switch and take a look at it. I'm in Korea so there aren't really any napa's or anything around, and the ones that are here definitely don't have Ford parts.

 

I got ya beat! My problem is when I turn my turn switch left or right the front turn lights work but the rear tail lights both flash together. Also only when turning left the third brake light flashes with them as well. Also the front left turn light goes and stays solid when stepping on the brakes. All three rear brake lights go solid when brakes are applied even with turn signals on.
Is it a short somewhere? I replaced the Multifunction switch and flasher relay , checked fuses and bulbs.

 

If I were you I'd replace the flasher. Some times the larger load caused by 4-ways can cause difficulty that isn't seen during smaller loads like your normal turn signals, so you only see it during the 4-ways.
Some trucks do have a separate flasher for the 4 ways, you may want to check for that.