SOHC.co.uk Forums > CB500/550

Cb550f blowing main fuse

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taysidedragon:
Check the connections on the back of the fuse box. They can get corroded and increase resistance, leading to blown fuses. Were your fuses old ones? The glass fuses can fail sometimes through ageing. I had one fail, the metal caps just separated from the glass.

Johnny4428:
I also have had the exactly same thing happen to me a few times in the past. I nearly always run with headlight on and sure enough that’s enough to blow the main fuse with the extra resistance at the poor fuse connections. Easily sorted with good clean and a little bending of the tabs at the fuse ends. Going to replace with blade fuse box at some stage. Not bothered about originality behind the panel in pursuit of reliability.

TrickyMicky:
I had this happen a couple of times on the 400. I was advised to check the multi-plug supplying the fuse holder. Sure enough, after 40 odd years all the spade connectors inside were a lovely shade of green. Did not take too long with a set of jewellers files to restore them, and no problem since. The person who told me to look there, also mentioned that with the glass fuses, if it fails with the wire broken inside the glass, then that is usually a short.  If it fails because the end cap on the fuse has parted company, as in my case, then that is because it has got hot trying to draw current through the corroded connections. 

Bryanj:
Look at the blown fuse and is it

1 melted in the middle with visible"blobs"

2detached at one end and "floating

Otis:
Crikey,

I had no idea there could be so many culprits!!

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