The H-4 Dual harness is needed if your bike has an H4 connector on the headlight
This harness will work with both single and dual headlight/ motorcycles and with most fits H-D Motorcycles or motorcycles that use a Dual Filament Bulb
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The H-4 Dual harness is needed if your bike has an H4 connector on the headlight. This harness will work with both single and dual headlight/ motorcycles and with most fits H-D Motorcycles or motorcycles that use a Dual Filament Bulb.