It looks like you purchased and installed the LED Trailer Tail Light w/ Reflector - Stop, Tail, Turn - Submersible - 7 Diodes - Round - Red Lens # STL13RFHXB on a trailer. Typically when this happens it indicates a bad ground somewhere on the trailer, so you'll want to check the ground connection on the right side light, as well as any ground wire for the entire trailer.
This would be a great starting point for your troubleshooting, but if all of your ground wires are firmly connected... view full answer...
The wiring for your 2018 Audi Q3 is a 2-wire system meaning that the turn signals and brake lights power travels through the same wire. When installing the ZCI Circuit Protected Vehicle Wiring Harness # 119250KIT the red sensor for the stop lights will not be used. To confirm that you have the correct wires the rear hatch must be closed for the signal to travel through the correct wires.
On your Q3 the red/black wire at each tail light should be the wire needed for the left and right... view full answer...
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