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Hello I will help you with your question,
Can you swap the left assembly to the right and see if it works?
Do you have a voltmeter to check the circuit if I guide you?
OK, so can you check at the switch to see if you have power there?
Please check fuse 4 and 20 in the junction block for power at the testpoints on the back of each fuse.
You can check for ground to the lamp at the black wire on its connector. Put one lead of the meter to a 12 volt source and use the other to touch the black wire pin. If you show 12 volts then you have ground.
Let me know what you are seeing so I can help
Fuse #6 as well, all should show 12 volts at both testpoints on each.