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Cb550f blowing main fuse

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Oddjob:
Yeah, I knew it was different lug shape but thought it was both sides. I bow to your knowledge on this as I don't have an F2 to compare it too.

Towsejames:

--- Quote from: Bryanj on August 10, 2026, 02:49:06 PM ---Look at the blown fuse and is it

1 melted in the middle with visible"blobs"

2detached at one end and "floating

--- End quote ---
It looks blown in half to me, but the replacement which blew right outside my house doesn’t look blown at all despite it definitely being blown. It even has continuity but when ignition is switched on drops volts - I’m guessing it’s slightly touching until load is going through it


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Towsejames:

--- Quote from: Oddjob on August 10, 2026, 06:12:10 PM ---Something odd here. The first pic is confusing. The tank looks like a 550K3 but the side panel badges are off a 550K0-2 not a K3. Totally different. Plus IIRC the 550F has one upper mounting lug going vertical and yours are both horizontal  The brake pedal is off a 550F, the 550K has a round tubular type. The clocks are blue faced, so either a 550F2 or a 550K3. The shape of the footrest brackets may clear it up as they are different IIRC between the 550K and the 550F. If the headlight was blowing the fuse why not the 7a fuse? try removing the headlight itself and run without it, see if it blows when the lights are on. If it doesn't suspect the lamp itself, if it does it's a wiring problem on the lighting circuit.

--- End quote ---
You’re completely right. The bike is a complete mix of 550k3 and 550f parts. The frame is and f but the tank and side panels are k3. I quite like that it’s all made up.


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Towsejames:
Thank you for all the replies and knowledge. I’ve been busy at work but did get to have a look.

I have since removed the original fuse box which was a mess of bad soldering and green wires. I have fitted a blade type fuse box now with space for spares and retained the original wiring which looked in good condition and crimped spade connectors to fit on the new fuse box. I then traced most of the main loom back which needed tidying up anyway. (So thought why not) no major shorts, bad connections or damage found as of yet. I’ve cleaned up all the plugs and bullet connectors which were all tarnished and green.

The last bit to do is to look in the headlight and continue to tidy up the loom. I have refreshed the tape with a fabric one I had which looks much tidier.

Yes the bike is a mix of k3 and f parts but it’s how it came and I quite like the look.

I’ll update once I get back on it if anything major is found!
 


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Bryanj:
The one gone in middle was high current, the one that looks good but isnt is vibration or the contact it clips into loose, so they went for different reasons and it could just be coincidence

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