I’m a big fan of modular connectors. Nothing bugs me more than having to desolder or otherwise put in a bunch of extra work to undo a permanent wiring connection before I can even start to fix something. In the case of my headlights, over two years ago I used crimp connectors to wire up the bulb sockets.

This worked pretty well for awhile but I found that perhaps the crimps weren’t 100%. Road vibration would occasionally cause a bulb to loose contact. Obviously this was not ideal, so I decided to ditch the crimps and just solder the wires together. But that brought me back to the whole “I don’t like permanent connections” thing. So I got an idea.
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