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Your 1800 shuts off the headlight when you press the starter button. 
This process of cycling power is hard on both the bulb and especially an HID ballast.  And the HID bulb. 
This harness changes the trigger to your low beam relay so that the low beams only get power after the bike's engine is started.
Easy installation under the seat. 

Fitment: 2001-10 Honda GL1800

p/n 02114 - $14.95