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Discussion Starter · #1 ·
I have a 2013 F150 Fx4 . I installed 3157 switchbacks ,bulbs light up white if slightly inserted into socket but no blinker/ flasher. I can remove bulbs rotate 180 degrees re-insert into socket and they light up Amber while flashing but no other function.
 

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Are you using a load resistor? Also where did you buy the bulbs from?
 

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So, if I understand it all correctly, There are 3157's that are wired to work for Chevys, and 3157s that work for basically everything else.

It sounds like, maybe the ones you got are the wrong gender.
 

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Discussion Starter · #9 ·
Thanks guys. I found that experiencing residual voltage from the turn signal module not allowing the running lights(white lights ) to come on . Load resistors solved that problem. I still haven't found out how to perform the bambi mod.
 
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