No Brake Lights - Ford Powerstroke Diesel Forum
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Old 01-29-2014, 05:11 AM
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No Brake Lights

All,

Electric once again on the old X. All lights work as advertised except the brake light (all three). Brakes work fine. There is also no signal going to the brake controller (controller does show a 'c' for connected) and brake lights on attached trailers are inoperative. All other functions on both the truck and trailer (running lights, 12v, blinkers, reverse, etc.) work fine.

There are no blown fuses anywhere in the panel. I replaced both #18 and #28 as they are marked as brake pedal position switch fuses (neither was blown). All connections are tight and no connectors are corroded.

I haven't gotten to testing Pin 5 on the BPP harness just yet as it's a tad bit chilly outside and the kids are not in school today.

Any other ideas? I couldn't find anything like this in the search.

Thanks,
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Old 01-29-2014, 08:04 AM
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Check brake light switch for power in ,then depress pedal should be power going out when depressed .thats where I would start !!!
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Old 01-29-2014, 08:06 AM
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Switch is on brake pedal arm above your foot !! Had this problem on another truck ( wire was broke in plug )
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Old 01-29-2014, 09:59 AM
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Thanks. Heading out to check it now.
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Old 01-29-2014, 11:37 AM
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Sometime it's nice to have that second 6.0L vehicle hanging around. I swapped the BPP switches and, ta-da, the brake lights worked just fine. Took the original switch apart and found that the "nub" on the spring between pins 4 and 5 had detached itself from pin 4 spring and permanently welded itself to the pin 5 spring. Resistance between the two pins when contacted is infinite. Good news is that Auto Zone sells the original Ford part for 12 bucks. The dealer wants almost 30.
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