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Author Topic: Headlight only functional in neutral and when clutch is engaged.  (Read 1133 times)

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Offline Kreb

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Headlight only functional in neutral and when clutch is engaged.
« on: June 20, 2019, 03:40:18 PM »
Hey guys,

I just wired up a new headlight on my 76' Cb 550. It looks great but its only lighting up when the bike is in neutral or when the clutch is engaged. I must have wired something up wrong but i'm not sure what it could be. For the headlight I wired in the new socket exactly how the older one was so it is most likely something else thats wrong. Let me know if you have any ideas.

Thanks
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Online calj737

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Re: Headlight only functional in neutral and when clutch is engaged.
« Reply #1 on: June 20, 2019, 08:33:38 PM »
Are you using an m-unit? If so, it’s pretty darn easy to wire it correctly. Pretty hard to wire it wrong.
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Offline HondaMan

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Re: Headlight only functional in neutral and when clutch is engaged.
« Reply #2 on: July 05, 2019, 07:15:48 PM »
If stock: the Green-Red wire in the headlight is the Neutral-safety circuit. The headlight is likely using that for its ground, so use a different Green (only) wire for the headlight.
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Offline ofreen

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Re: Headlight only functional in neutral and when clutch is engaged.
« Reply #3 on: July 06, 2019, 09:39:16 AM »
Yes, the headlight is not grounded correctly.
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'75 CB750F

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