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Honda CBF Hornet 02 electrical problems

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MrHornet02
L Plate Warrior



Joined: 16 Jan 2023
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PostPosted: 15:39 - 16 Jan 2023    Post subject: Honda CBF Hornet 02 electrical problems Reply with quote
Hello from Sweden, Excuse my English as it's not my native language but I hope you'll understand.

So recently I've had some problems with my Hornet, it started off with my right blinker going very fast, then all of my lights shut off ( except for the headlight)

I got it working again when I switched out the fuse for the headlights but it stops working again when I drive it ( if it's idle it will work)

I've tried checking the cables and I've found no issue there, but I am not experienced in working on bikes.

Any help is very appreciated!
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Holdawayt
Trackday Trickster



Joined: 27 Jul 2015
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PostPosted: 16:58 - 16 Jan 2023    Post subject: Reply with quote
I've rebuilt a few hornets but the wiring always seems to be intact and working.
All I can think is that you've got an earth cable somewhere that's shorting on a metal component or maybe a wire is loose and is coming away from it's contact when you're on the move.

If you really struggle, a full wiring loom would be easily found on ebay, it'd be a job for an amateur, just take it slowly and take a lot of pictures as you remove the old one.
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WD Forte
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Joined: 17 Jun 2010
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PostPosted: 17:01 - 16 Jan 2023    Post subject: Reply with quote
I'd start by measuring the voltage across the battery terminals when the engine is running. Lights on and off
I would expect to see no more than 14-14.5V
anything significantly higher say 15V or more would suggest either
a bad rectifier/regulator or a badly grounded one.

On a 20 year old bike I would not be surprised to find poor connections and grounding, so would check and clean as many as I could.
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WD Forte
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Joined: 17 Jun 2010
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PostPosted: 17:13 - 16 Jan 2023    Post subject: Reply with quote
Holdawayt wrote:
an earth cable somewhere that's shorting on a metal component


That's what we call a ground.

There's no need to buy another loom/harness when all you have is a few iffy connections.
You wont find a new one for a 20 year old Hornet it would be hundreds of pounds if you could anyway.
A second hand one may be no better or have other unknown problems of its own

A meter and notepad is all you need
Take readings make notes and learn about your bike as you go
a manual with wiring diagram to refer to would help
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MrHornet02
L Plate Warrior



Joined: 16 Jan 2023
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PostPosted: 00:10 - 13 Feb 2023    Post subject: Reply with quote
WD Forte wrote:
Holdawayt wrote:
an earth cable somewhere that's shorting on a metal component


That's what we call a ground.

There's no need to buy another loom/harness when all you have is a few iffy connections.
You wont find a new one for a 20 year old Hornet it would be hundreds of pounds if you could anyway.
A second hand one may be no better or have other unknown problems of its own

A meter and notepad is all you need
Take readings make notes and learn about your bike as you go
a manual with wiring diagram to refer to would help


Thank you guys, i've tried most stuff now and when i removed the relay for the blinkers ( i believe ) it worked, my MC haven't blown a fuse yet, but i'm still wondering why the relay would blow my 10A fuse? Seems a bit odd. https://www.cmsnl.com/honda-cb600f-hornet-2002-2-european-direct-sales_model1638/relay-compwinke_38301kk9952/
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Zen Dog
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Joined: 11 Aug 2004
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PostPosted: 00:48 - 14 Feb 2023    Post subject: Reply with quote
You can get the Honda workshop manual here -

https://drive.google.com/open?id=1d6cBuEX9SwFkZHtypQ1djFBTVf6qcl0P
https://www.motorcyclemanuals.info/motocycles-atvs/honda/

At the back is the wiring diagrams (sadly not in colour).
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My bike trip around S.E. Asia 2010/2011
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Old Thread Alert!

The last post was made 1 year, 65 days ago. Instead of replying here, would creating a new thread be more useful?
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