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Signal light not working

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Old Mar 11, 2025 | 06:34 PM
  #1  
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From: Rochester Wa
Signal light not working

Hi All.
I own a 2016 F-250 Super Duty with the 6.7 L diesel. My problem is that the back right signal light isn't working. The front and mirror signals do work. I chased the purple/orange wire from the taillight to the large connector on the frame just in front of the bumper. That wire has continuity. There is No power to that large connector. The Trailor connection and left signal do work.
My question is, is there a module somewhere in that system that could be the problem?
This is the most difficult truck I have ever worked on electrical system wise!
Thanks All!
 
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Old Mar 11, 2025 | 06:40 PM
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From: San Diego
On my 2001 there are towing signal flasher relays under the hood.

From the factory they were not installed.

I installed them after adding trailer wiring stuff back bumper.
 
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Old Mar 11, 2025 | 06:59 PM
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From: Rochester Wa
Mine has that relay.
Thanks!
 
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Old Mar 11, 2025 | 08:08 PM
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You'll need to read codes with something that'll pull codes from all modules, such as Forscan. You're looking for body control module (BCM) codes.
 
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Old Mar 12, 2025 | 10:53 AM
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From: Rochester Wa
Originally Posted by Pikachu
You'll need to read codes with something that'll pull codes from all modules, such as Forscan. You're looking for body control module (BCM) codes.
Thank you. I never thought of checking the codes!
 
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