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Fuse blow's , short to ground in that circuit somewhere . Viewing wiring diagrams ,so you know which wire's to test using a DVOM - digital volt ohm meter . Or a special short finder tool is how you find the problem . Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine . Under system click on lighting ,then under subsystem click on turn signal lamp . Click the search button then the blue links. How to find automotive electrical shorts
Principles of Operation
The lighting control module (LCM) controls the flashing of the turn signal and hazard lamps. Power is routed through the multifunction switch to the LCM. When the multifunction switch is placed in the LH turn, RH turn or hazard lamps ON position, the LCM will command those lamps on and off.
have it checked for DTC'S diagnostic trouble codes
Turn Signal/Hazard Power Feed Short to Ground
Go To Pinpoint Test O .
Do you know anything about automotive electronics ? Stoplamps
The stoplamps are part of the rear lamp assembly. When the brake pedal is applied, the stoplamp switch supplies voltage to the generic electronic module (GEM) and the high mounted stoplamp. The GEM then supplies voltage to the rear lamps.
Turn Signal Lamps and Hazard Warning Lamps
The turn signal lamps and hazard warning lamps system consists of:
Turn signal lamps
When the multifunction switch is placed in the LH or RH turn positions, a voltage signal from the GEM is routed to ground. When the GEM detects the multifunction switch in the LH or RH turn position, the GEM supplies voltage to the appropriate turn lamps in a flashing manner. When operating correctly, the turn lamps flash approximately 80 times per minute.
When the hazard warning switch (located in the upper part of the center console) is switched on, a voltage signal from the GEM is routed to ground. When the GEM detects that the hazard switch is switched on, the GEM supplies voltage to all the turn signal lamps in a flashing manner. When operating correctly, the hazard lamps flash approximately 80 times per minute.
Do you know how to test electrical circuits with a DVOM - digital volt ohm meter , how to read an use a wiring diagram to pin point locations in a electrical circuit for testing B+ voltage an ground ?
Free wiring diagrams http://www.bbbind.com/free_tsb.html Enter your vehicle info . year ,make , model an engine size . Under system click on lighting ,then under subsystem click on turn signal lamps . Click the search button then each blue link , one at a time .
Hope you can read diagram? Did you check for voltage at turn fuse? Use a test light, goes hot with key on. Use a chassis ground when checking for voltage. The voltage wire from flasher to multifunction switch for turn is orange with black tracer, check that also. Let us know what you find?
I am not familiar with this vehicle, but I am confortable with wiring diagrams. I pulled the electrical diagram for the model year 1999 HD/350/SUPER DUTY (which would include your F-550). I would suspect the hazard switch in your multifunction switch/arm/wiper lever. It is the only common thing between the 2 systems, and both are wired through 2 different flasher assemblies through 2 separate wires to the multifunction switch/arm. In fact, the hazard lights are a hot battery item and bypass the turn signal switch for the front turn signals as well as the indicators in your dash.
Try to check if your stop lights do come on when you hit the brakes... if they don't, your problem is really with the hazard switch within the multifunction switch/arm.
I do not know if this switch can be replaced separately from the multifunction switch/arm, but from what I found surfing the net, the whole thing (multifunction switch/wiper lever) goes for about 50$. There are some DIY on the internet to replace the assembly, but it would seem it can be a bit tricky to replace for someone not familiar around the steering wheel portion.
The hazard lights are wired so they will flash when the hazard switch is on, regardless of whether the tractor is running. Assuming you have tried flicking the hazard light switch on and off, and the lights flash no matter what position it's in, then I think the hazard light switch is shorted. Pull one of the wires off the back of that switch to stop the flashing, then order a replacement switch - it's not an expensive part. Good luck!