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Front left blinker doesn't work. Swapped/ changed bulbs, replace blinker relay, checked fuses. Right front, left & right rear, 4 ways, brakes all work. Plus dome light is always on & its not the dimmer switch twisted all the way on. How do I test the 3 wire button in the door?
 

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2013 F-150 XLT 4WD with 5L
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Hi Blake, welcome to the forum!

For the turn LF turn signal, assuming the correct replacement bulb was used, check the wiring and, more specifically, the ground. Without a good ground it will not work.

For the dome light (again, assuming it is the interior light) do the under dash lights stay on with the door closed, or the head lights/key buzzer sound with the door closed? Again, check the wiring (both sides) for chaffing/crossed wires.

Mac
 
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