Recently was intermittently getting the P0504 (brake switch correlation) code, but brake lights still worked just fine. Figured it would be good to replace the switch just to clear the code and be set. Unfortunately this started a much more serious issue. After pulling my battery for about an hour while doing a short shifter install I also did the brake switch while battery was out. Upon reinstalling battery and starting car my brake lights no longer function at all. I have exhausted all efforts in my search for the culprit:
-Checked fuse for brake lamps
-Checked continuity of that fuse it’s good
-Fuse gets current
-Tail lights have current and still operate just no brake lights including 3rd
-pulled down wiring for brake switch connector and traced back into a bundle I know power is good in and no live wires to be found.
Only thing I’ve discovered thus far is that if I use my multimeter to probe one twilight parking light socket it will light the opposite brake light up, but will not respond to brake switch input. I’m stumped at this point and will likely have to rack up a big bill at automotive electrician because I’m sure Ford won’t figure it out. Any advice or input would be greatly appreciated. Thanks in advance
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-Checked fuse for brake lamps
-Checked continuity of that fuse it’s good
-Fuse gets current
-Tail lights have current and still operate just no brake lights including 3rd
-pulled down wiring for brake switch connector and traced back into a bundle I know power is good in and no live wires to be found.
Only thing I’ve discovered thus far is that if I use my multimeter to probe one twilight parking light socket it will light the opposite brake light up, but will not respond to brake switch input. I’m stumped at this point and will likely have to rack up a big bill at automotive electrician because I’m sure Ford won’t figure it out. Any advice or input would be greatly appreciated. Thanks in advance
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