Tail light issues

I have a 2014 177 and my left tail light is not working properly. The running lights work fine on all lights (including the left side) but the left turn signal doesn't. When the running lights are (off) the left turn signal works but is very very weak. All other lights work fine. (The left turn signal on the truck works fine).

I'm not sure if it is a wiring issue or the entire left rear light needs replacing.

I was unsuccessful when attempting to take off the rear reflector to get to the LED bulb, they have it stuck/glue on pretty well.

Any one else had to replace the rear turn signal lights?

Thanks

The stop, tail, turn lights are sealed units, no way to get inside. Are the brake lights on the left side weaker? The turn and brake lights should be the same brightness.

The LED lights take a voltage between 9-14 Volts to operate. There is a regulator in the light that drops it to 6-9 Volts that way voltage fluctions don't affect the lights. If something is wrong with the circuit inside the light there is not much you can do. The circuit controls the brightness of stop-turn and tail

Yes the whole light is replaced. If you have a volt meter to check what is going to the light. I can access my light thru the rear storage pass thru. You have to remove the panel protecting the back of the light.

LEDs are generally manufactured in China, and their quality is often suspect. Not really the fault of FR, that is where the LEDs come from and a lot of Chinese factories only care about throughput metrics. Things like household LED bulbs are very reliable now, but the low cost ones used in exposed weather situations like tail lights can still have much higher failure rate.