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Headlight, daytime and turn problem.

Drevnr

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Hi guys. I have a problem. When I turn on the turn signal, my truck's headlights flash with daytime running lights. The turn signal is not active. I solved the problem by connecting the wires that supply current to the turn signal and daytime running light diodes in the headlight itself after the headlight module. This way, my daytime running lights and turn signals are constantly on, but when I turn on the turn signal, the daytime running lights and turn signals flash at the same time. what could be the ideas. is the problem in the headlight unit?

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HammaMan

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I don't see the headlights flashing, just the DRLs. The DRLs are 'always on' when the truck is being driven. What are you trying to achieve overall?
 
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Drevnr

Drevnr

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Sorry, English is not my native language. I want to say that my turns don't work. When I turn on the turn signal, the DRL running lights flash. Such as raptor.
 

HammaMan

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Understand the language barrier.

A 2021 lariat 501 did not come with those headlights. Someone has added them. They probably added them incorrectly and used a raptor conversion harness for some reason. 501 lariats came with quad beam LED lights like these

Ford F-150 Headlight, daytime and turn problem. 1740853486862-iz


You need to separate the DRL circuit from the blinker circuit. Here are the diagrams. C1284 and 1285 are the same, one is left headlight, one is right headlight.

Ford F-150 Headlight, daytime and turn problem. 1740853705899-sd


Ford F-150 Headlight, daytime and turn problem. 1740853641694-jz


Pin 14 is optional and may or may not be there.
Ford F-150 Headlight, daytime and turn problem. 1740853797609-5l


These are the pin numbers as viewed from the front of the connector, not the rear
Ford F-150 Headlight, daytime and turn problem. 1740853834146-sn


Ford F-150 Headlight, daytime and turn problem. 1740854126182-ox
 
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Drevnr

Drevnr

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Thank you very much for the quick response. I redid the wiring myself. Tomorrow I will check the connections again and draw a diagram, maybe I made a mistake somewhere
 

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Drevnr

Drevnr

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Dear @HammaMan! This is my wiring diagram. I checked it three times. You might see an error.

Ford F-150 Headlight, daytime and turn problem. IMG_20250311_152637
 

HammaMan

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If your pinout checks okay, the issue may be in the BCM programming.
Post your vin or PM it to me
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