No brake, signal or hazard lights

Tiny
TIM NUMMY
  • MEMBER
  • 2000 FORD F-250
  • 7.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 290,000 MILES
I have checked all the fuses and changed the multi-function switch. No help.
Do you
have the same problem?
Yes
No
Sunday, May 15th, 2016 AT 12:54 PM

14 Replies

Tiny
CARADIODOC
  • EXPERT
Check for 12 volts on fuses 1 and 13 in the fuse box inside the truck.

Does the horn work?
Was this
answer
helpful?
Yes
No
-1
Sunday, May 15th, 2016 AT 1:24 PM
Tiny
TIM NUMMY
  • MEMBER
Power to both fuses and the horn works.
Was this
answer
helpful?
Yes
No
Sunday, May 15th, 2016 AT 1:49 PM
Tiny
CARADIODOC
  • EXPERT
Next, check for 12 volts on the light green / red wire at the brake light switch. If you have it there, push the brake pedal, then check on the light green wire.
Was this
answer
helpful?
Yes
No
Sunday, May 15th, 2016 AT 2:00 PM
Tiny
TIM NUMMY
  • MEMBER
I have power to the light green, and power to the light blue pin 44 on the multi-function switch also.
Was this
answer
helpful?
Yes
No
Sunday, May 15th, 2016 AT 3:18 PM
Tiny
CARADIODOC
  • EXPERT
Now hold on a minute. You have multiple circuits that are not working, that are fed from multiple places. What they all do have in common, it appears, is the grounds. Does your center high-mount brake light work? That is the only one that has a ground that is not shown on my diagram. The rest all appear to be grounded at the "left rear of the vehicle".

Check for voltage on the light green / orange wire at the left rear brake light bulb, and / or the orange / light blue at the right side, with the brakes applied by a helper. (I use a stick between the seat and the brake pedal to gold the pedal down). If you have voltage to those places, it is the ground wire you have to follow. Ford likes to bolt a number of ground wires to the same stud, so if that terminal corrodes off, you will have a number of dead circuits.
Was this
answer
helpful?
Yes
No
-1
Monday, May 16th, 2016 AT 8:01 PM
Tiny
TIM NUMMY
  • MEMBER
No power from both sides.
Was this
answer
helpful?
Yes
No
Wednesday, May 18th, 2016 AT 6:17 PM
Tiny
CARADIODOC
  • EXPERT
Okay; double-check that you have voltage on the light green wire at the signal switch when the brake pedal is pressed. Next, check for 12 volts on the white / red wire, also at the signal switch. The first is the 12 volt feed from the brake light switch. The second is the hazard circuit feed from the flasher assembly.
Was this
answer
helpful?
Yes
No
Wednesday, May 18th, 2016 AT 6:43 PM
Tiny
TIM NUMMY
  • MEMBER
Light Green yes, White/Red NO
Was this
answer
helpful?
Yes
No
Wednesday, May 18th, 2016 AT 7:15 PM
Tiny
CARADIODOC
  • EXPERT
Check on the light green / orange and the orange / light blue coming out of the signal switch, both when the brake pedal is pressed.
Was this
answer
helpful?
Yes
No
Wednesday, May 18th, 2016 AT 7:27 PM
Tiny
TIM NUMMY
  • MEMBER
No, Neither one lights up.
Was this
answer
helpful?
Yes
No
Wednesday, May 18th, 2016 AT 7:33 PM
Tiny
CARADIODOC
  • EXPERT
Gotta be a bad signal switch or there's a different problem and the hazard switch is turned on. You can verify this by jumping the light green to the light green / orange wire. That should make the left rear brake light work.
Was this
answer
helpful?
Yes
No
Wednesday, May 18th, 2016 AT 7:40 PM
Tiny
TIM NUMMY
  • MEMBER
MMMM Interesting. I tried the jumper, but both brake lights came on. And after taking the jumper wire out, I step on the brake and nothing comes on, but if I push down on the hazard switch, both brake lights come on.
Was this
answer
helpful?
Yes
No
Wednesday, May 18th, 2016 AT 7:53 PM
Tiny
TIM NUMMY
  • MEMBER
Man, what a freekin mind bender!
Was this
answer
helpful?
Yes
No
Wednesday, May 18th, 2016 AT 7:55 PM
Tiny
CARADIODOC
  • EXPERT
Check the signal switch connector for stretched or corroded terminals. That's right for both brake lights to come on. The signal switch ties them together when the signals are off. I forgot about that.
Was this
answer
helpful?
Yes
No
Wednesday, May 18th, 2016 AT 8:03 PM

Please login or register to post a reply.

Recommended Guides