No brake lights, signals, or 4-way's - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 01-11-2014, 02:19 PM Thread Starter
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No brake lights, signals, or 4-way's

Well this is really getting to be a major pain in the ***.

So i have running lights, but everything else in the rear does not work.
In the front, everything works as it should. Signals work, 4-ways work, high beam.... So i think that throws the multi-function switch out of consideration.

I tested the brake pedal sensor with my AE and it works as it should.

Checked every fuse in the panel, they all check out.
My flasher relay is clicking like crazy, but i still have front signals flashing.

The only thing i found that might be the culprit is a corroded wire on the 4 prong trailer connector. One wire and terminal is completely gone, turned to dust.


Any ideas?


2002 F350 CCLB DRW
ZF6 SWAPPED! --Southbend 1944-6OFEK
12.5in lift on 24.5's----------3" Body Lift
MBRP Dual 4"--------------Muffler Delete
K&N Intake----------------AFE Spider
Garret GTP38R BB--------- P.I.S. billet wheel
TS 6pos chip--------------NLTD tunes
P.I.S. 200cc/80%--------- P.I.S. IDM
Parrot Asteroid-------Boston Accoustic SR80's
NVX VCW 10”s------------ McIntosh MC431
Warn Manual hubs---------Bed Rails/Air tank
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post #2 of 2 Old 01-12-2014, 05:39 PM Thread Starter
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Anything? I've looked in many many threads about this, but nothing seems to work.
I've found about 5 wires in the rear harness that i fixed, but still no luck.

I replaced the multi-function switch today, still nothing. Didn't expect it to fix the problem as my front signals are working. Just piece of mind...

I ordered the trailer harness and flasher relay, so ill replace those tomorrow.

Also found a blown resistor in my taillight, so that also may be the culprit... but then again i do have running lights working.


2002 F350 CCLB DRW
ZF6 SWAPPED! --Southbend 1944-6OFEK
12.5in lift on 24.5's----------3" Body Lift
MBRP Dual 4"--------------Muffler Delete
K&N Intake----------------AFE Spider
Garret GTP38R BB--------- P.I.S. billet wheel
TS 6pos chip--------------NLTD tunes
P.I.S. 200cc/80%--------- P.I.S. IDM
Parrot Asteroid-------Boston Accoustic SR80's
NVX VCW 10”s------------ McIntosh MC431
Warn Manual hubs---------Bed Rails/Air tank
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