Left side aftermarket new led taillights not working but have reverse, turn, and brake but no tail

[Redbighorn69]

I’ve fighting these lights forever. When I first uninstall the factory lights and reinstall the new leds the led lights work. But when I turn the truck on the left side begins to blink they eventually turns off but I still have brake turn and reverse on that light. I’ve flipped the lights to see if it was the lights themselves but the other light does the same thing. Any help?

 

[1stindoor]

Have you tried packing the plug (both sides) with electric grease? Solved my similar problem a few years ago.

 

[Bigskyroadglide]

Did you have led tails prior to installing leds?