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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
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Old Mar 31, 2013 | 12:22 PM
  #16  
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Alrighty, good that you have 12v at RED/BLK when pedal is pressed.

Do you have the column apart enough that you can backprobe the TSS? (EDIT: turn signal switch, sorry I work with a lot of Fords at my shop and they have a ton of acronyms)?

If so, put a your red lead at the RED/BLK right at the TSS, and your black at shiny metal with brake pedal depressed. Then do it at WHT/RED right at the TSS wit the hazards on. You can unplug the harness too and do it from the front side, but DO NOT damage the pins. Lightly touch them. Do you have 12v at that location?

If you do, there's just 1 or 2 tests left to tell me what exactly it is.

Do your front blinkers work when you have the hazards on?
 
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Old Mar 31, 2013 | 12:38 PM
  #17  
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I have 12 v at both red/black and white/red. YEH
When I turn on hazzards, no front lights flash.
When the front blinker is on and I turn on the hazzards the blinker stops working.

EDIT I just recheched red/black NO power
EDIT EDIT I have power at red/black with pedal pressed
 
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Old Mar 31, 2013 | 12:56 PM
  #18  
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With harness connected, red lead at GRN or YEL/BLK and black lead at shiny metal, you have 0v, correct?
 
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Old Mar 31, 2013 | 01:07 PM
  #19  
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I have 12v power at lime fat green wire with pedal pressed but that is with green wire disconnected at right rear ! if I connect right rear green wire than no power at green wire at steering column

If I take out right rear bulb I got power to socket
NO power to green wire at column.

Sorry for all the confusion!
 
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Old Mar 31, 2013 | 02:08 PM
  #20  
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But no power at YEL/BLK?
 
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Old Mar 31, 2013 | 02:19 PM
  #21  
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Do you have a good chasis ground for rear harness ?
 
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Old Mar 31, 2013 | 02:25 PM
  #22  
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No power at skinny yellow with black stripe leading into steering column.

I have good ground,turn signals work good.
 
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Old Mar 31, 2013 | 02:39 PM
  #23  
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Sorry, sorry Please go back to link #10
I have power into switch through red wire but no power out of switch (red/black) wire with pedal pushed
EDIT
I had all the wires to the back sockets unplugged when testing the first time.
If I take out right rear bulb I have power to boo switch in and out.
 
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Old Mar 31, 2013 | 02:56 PM
  #24  
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putting this up so we have something to refer to .. notice turn signal and emergency flasher switch top left
 
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Old Mar 31, 2013 | 03:02 PM
  #25  
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Thanks for the pic but I CAN'T make heads or tails of any of that! I'm a house painter by trade,20 years LOL
 
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Old Mar 31, 2013 | 03:05 PM
  #26  
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this is a 79 diagram for the F100
 
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Old Mar 31, 2013 | 03:16 PM
  #27  
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looking at the last diagram the RED / WHT wire feeds the brake switch from the 20A fuse and it also feeds the hazard flasher.. Fuse block --> right bank lowest down
check
 
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Old Mar 31, 2013 | 03:25 PM
  #28  
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Wait, what?

I'm confused about what you did unplugging the sockets. To me it sounds like when you unplug your right socket then the BOO switch doesn't work???? Is that what you're saying?

Plug everything back in, and then try the BOO switch again like in post #10.
 
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Old Mar 31, 2013 | 03:26 PM
  #29  
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My brake light switch has a red and red/black wires to it, then red/black into steering column.
 
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Old Mar 31, 2013 | 03:29 PM
  #30  
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When everything is plugged in , the boo switch has no power coming out.
 
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