[BoxsterInTheSun]

Originally Posted by 78F350

The wiring inside the headlights of these car is biodegradable. I expect that the insulation had come off some of the wiring inside the headlight and is shorting across the different lights.
Remove the headlight, pull off the back cover and take a look at the wiring.

https://986forum.com/forums/performance-technical-chat/46497-986-boxster-melted-headlight-wiring-repair.html

Thanks for the pointer! It honestly looks like a mess. Cracked insulation everywhere with quite a few patches of exposed wire. I did my best to patch it up with liquid tape, but get the same results. Someone else had mentioned that it might be the polarity of the LED bulbs so I'll also try and turn those around in the hopes it's that instead...