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Re: LED front turn signals
I am pretty sure the front side markers on those trucks are wired like the 71-72 trucks. The side marker is grounded through the front turn bulb/element. This allows the side marker light to alternate flashing with the front turn signal. As electricity only flows one way through an led, the ground is lost for the side markers when leds are installed in the front turn location. This renders the side markers inoperable.
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