Hi,
The LED lighting electronics in the assembly have likely failed. The only repair is replacement. There is a printed circuit board integral to the assembly that controls voltages.
I attached a pic below showing the right tail lamp wiring. Check to see if the wiring coming to the assembly is getting power. You can use a test lamp. If they are, the assembly needs to be replaced.
Let me know.
Joe
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Saturday, December 23rd, 2023 AT 9:18 PM