Signal Dynamics Corporation Plug and Play Harness Adapter 01083 This is the harness you need if your bike has an H4 connector on the headlight when installing the plug and play headlight module 445-956 Will only work with a single headlight motorcycle Works with most Harley Davidson motorcycles or motorcycles that use a Dual Filament BulbNote: Requires the Plug and Play Headlight Module 445-956