I just installed this unit on my 2018 St Glide Special. It's fully compatible - everything you need comes with this device. The wiring harness side of the included Y adapter can be installed backwards, so take care of your wiring. Take some photos before disassembly, it will help. Each connector (2) on the harness side of the Y-adaptor has a black wire to connect to the black wire on the headlight side of the Y-adaptor. I don't think this unit is as bright as the stock headlight, but you know you bought it because it's smoky and looks cool on a blacked out bike.
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