Ford F150 rear right BRAKE light problem
 

1976 Ford F150 pickup truck is having rear right brake light problem.
The rear right brake light does not come on during braking. it also
does not come on during hazard flasher use.

1. Rear, right and left RUNNING lights work fine.
2. Rear, right and left TURN signals work fine.
3. Rear LEFT brake light works fine
4. Rear RIGHT brake light does NOT work
5. Hazard lights work EXCEPT for RIGHT...which does NOT light up.

I have changed bulbs, flashers, and tested the socket and wiring up to
the connector under the tailgate and the bulbs etc are fine. Since
both directionals are working, and the directionals use the SAME
filament as the brake, I know it is something else.

Any ideas? How to chase down this gremlin. Spent all day
cutting/splicing/trying to islolate the problem to no avail.

Any ford techs on here can help?

Ford F150 rear right BRAKE light problem
 

TOP POST

It could be a break in the wire going from the left side tail light to
the right side.
Under the bumber?

Alan


papadad wrote:
> 1976 Ford F150 pickup truck is having rear right brake light problem.
> The rear right brake light does not come on during braking. it also
> does not come on during hazard flasher use.
>
> 1. Rear, right and left RUNNING lights work fine.
> 2. Rear, right and left TURN signals work fine.
> 3. Rear LEFT brake light works fine
> 4. Rear RIGHT brake light does NOT work
> 5. Hazard lights work EXCEPT for RIGHT...which does NOT light up.
>
> I have changed bulbs, flashers, and tested the socket and wiring up to
> the connector under the tailgate and the bulbs etc are fine. Since
> both directionals are working, and the directionals use the SAME
> filament as the brake, I know it is something else.
>
> Any ideas? How to chase down this gremlin. Spent all day
> cutting/splicing/trying to islolate the problem to no avail.
>
> Any ford techs on here can help?

Ford F150 rear right BRAKE light problem
 

Anyone have a wiring diagram to explain what the 4 wires from the front
of the vehicle to the rear bumper do? I am guessing that one is brake,
one is left turn, one is right turn, and one is reverse. am I on
the right track? And also a wiring diagram from those 4 wires to the
2 brake lights (2 filaments each)? Is the TURN signal (blink
on/off) on the same line as the BRAKE signal? Does my question even
make sense?

Ford F150 rear right BRAKE light problem
 

papadad wrote:
> Anyone have a wiring diagram to explain what the 4 wires from the front
> of the vehicle to the rear bumper do? I am guessing that one is brake,
> one is left turn, one is right turn, and one is reverse. am I on
> the right track? And also a wiring diagram from those 4 wires to the
> 2 brake lights (2 filaments each)? Is the TURN signal (blink
> on/off) on the same line as the BRAKE signal? Does my question even
> make sense?

I've always wondered what the mechanism was on how the turn signal
overrides the brake light signal.

Ford F150 rear right BRAKE light problem
 

"papadad" > wrote in message
ups.com...
> Anyone have a wiring diagram to explain what the 4 wires from the front
> of the vehicle to the rear bumper do? I am guessing that one is brake,
> one is left turn, one is right turn, and one is reverse. am I on
> the right track? And also a wiring diagram from those 4 wires to the
> 2 brake lights (2 filaments each)? Is the TURN signal (blink
> on/off) on the same line as the BRAKE signal? Does my question even
> make sense?
>

From memory, The brown wire is running /park lights. The yellow is left
turn/brake light. The green is right turn/brake. Purple is back-up lights.
Same bulb filament is used for brake and turn signal.
Make sure the bulb is an 1157 bulb, and is inserted correctly. Also make
sure any trailer wiring that has been added on is connected correctly.


--
Kevin Mouton
Automotive Technology Instructor
"If women don't find you handsome, they should at least find you handy"
Red Green

Ford F150 rear right BRAKE light problem
 

Alan wrote:
> papadad wrote:
>
>>Anyone have a wiring diagram to explain what the 4 wires from the front
>>of the vehicle to the rear bumper do? I am guessing that one is brake,
>>one is left turn, one is right turn, and one is reverse. am I on
>>the right track? And also a wiring diagram from those 4 wires to the
>>2 brake lights (2 filaments each)? Is the TURN signal (blink
>>on/off) on the same line as the BRAKE signal? Does my question even
>>make sense?
>
>
> I've always wondered what the mechanism was on how the turn signal
> overrides the brake light signal.
>

It's built into the turn signal switch. With the lever in the "neutral"
position, both rear lights are connected to the output of the brake
light switch. When you signal a lane change, one of the lights is
disconnected from the brake light switch and connected to the output of
the turn signal flasher.

nate

--
replace "fly" with "com" to reply.
http://home.comcast.net/~njnagel

Ford F150 rear right BRAKE light problem
 

Most common problem with brake or tail lights is a bad
ground. The light assembly is grounded to the body, and road salt or
other junk causes corrosion at the connection and ruins it.

Dan

Ford F150 rear right BRAKE light problem
 

Your common issue seems to be with the emergency flasher. I would be
checking out that switch for a bad connection. The hazards and brake
lights are on the same fuse likely so are on the same wiring circuit.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

papadad wrote:
>
> 1976 Ford F150 pickup truck is having rear right brake light problem.
> The rear right brake light does not come on during braking. it also
> does not come on during hazard flasher use.
>
> 1. Rear, right and left RUNNING lights work fine.
> 2. Rear, right and left TURN signals work fine.
> 3. Rear LEFT brake light works fine
> 4. Rear RIGHT brake light does NOT work
> 5. Hazard lights work EXCEPT for RIGHT...which does NOT light up.
>
> I have changed bulbs, flashers, and tested the socket and wiring up to
> the connector under the tailgate and the bulbs etc are fine. Since
> both directionals are working, and the directionals use the SAME
> filament as the brake, I know it is something else.
>
> Any ideas? How to chase down this gremlin. Spent all day
> cutting/splicing/trying to islolate the problem to no avail.
>
> Any ford techs on here can help?

Ford F150 rear right BRAKE light problem
 

Thanks to those who replied.

1) there are no trailer wires
2) all grounds are good, re-done, new etc. So not a ground problem
3) flasher itself (both turn and hazard) are working normally so not
the flasher
4) i actually re-wired (temporarily) the RIGHT lights to the LEFT
lights (in parallel) and everything works...further confirming it's not
something ike a light bulb or a bad ground at the bulb socket.

The above post gives me a real (not a guess) lead -- I now suspect the
trouble is in the turn signal switch itself - with the lever in
neutral, both rear lights SHOULD be connected to the output of the
brake light switch. But one is not lighting...maybe the turn signal
switch on the steering column is faulty. It would also explain why,
when using either right or left TURN (when the switch is in turn mode,
not neutral positiong) that the rear lights each blink properly, ie,
the wiring and the bulb and the socket are all functioning
NORMALLY...also, no fuses are blowing so there is not a short anywhere.
Remembering that the Blink and Brake are on the SAME circuit.
So...somehow the TURN position is working but the BRAKE position
(right side) is NOT.

I bet a dozen donuts it's a faulty turn signal switch. This is the
best thing to go on, thus far, i mean, logically this makes perfect
sense and the reason why I found no probems in the rear-end wiring
after hunting for 2 to 3 hours the other day. No problem to be found
back there....

Any other thoughts?

Ford F150 rear right BRAKE light problem
 

Yep - I bet the turn signal switch "Neutral" position is bad. Try
dis-assembling, cleaning, or at least wiggle it around a bit.