SOHC.co.uk Forums > CB500/550
Cb550f blowing main fuse
Otis:
Thanks Bryan,
Since my last post I have now discovered that the winker relay is shot so new one is ordered. I also traced the wire from the rear brake switch and found a black wire completely severed. As it is impossible to get at I am now in the process of removing the complete air box and all associated paraphernalia. What a nightmare to get at.
Whether either or both of these were the cause of my blown fuses remains to be seen but it's always nice when you do actually find a fault.
Bryanj:
If the black from the loom touched anything metal that would blow your fuse as black wires are 12v positive when key is turned on
Otis:
--- Quote from: Bryanj on August 18, 2026, 04:54:16 PM ---If the black from the loom touched anything metal that would blow your fuse as black wires are 12v positive when key is turned on
--- End quote ---
The offending black wire that almost certainly has to be the culprit.
Just as an aside, I purchased a repro winker relay from David Silver for £18.50 delivered whereas they wanted £51.50 for a genuine part, the differential being just too far apart.
Towsejames:
--- Quote from: Oddjob on August 17, 2026, 12:23:55 AM ---I have around 3-4 full clutches for the 550. You want a set of plates, steel or friction?
Just pay the postage.
--- End quote ---
Very interesting! I’ll send you a message
Sent from my iPhone using Tapatalk
Bryanj:
That wire definately looks like its rubbed through on something
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