SOHC.co.uk Forums > CB350/400

Electrical Failure

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BigAl (Alan):
I would agree with hairy, check your key switch. The other is the fuse box, if its original (as image) take it off and check the terminals at the
rear. The copper and solder terminals may look OK, but they will become brittle/overheated with age.

mike the bike:
The socket for the fuse holder, a 6 way block with spades, is a favourite for bad contacts.  The contacts go green and cruddy which can lead to overheating due to the amount of current flow.  The fuse holders themselves may need a polish with autosol so they make a reliable contact.
The key switch could have intermittent contact.  Strip, clean and grease to keep the moisture out.

Velofello:
Thanks for all your replies. They all seem to be pointing me in a similar area, ignition switch & fuse holder. When I get some free time I will look at these and report back as it may help others. Of course the obvious solution is to stay away from yellow ones !

Harold 400/4:
Had this some years back on my 400/4.  Turned out it was dirty connections where the main fuse sits in the fuse holder. Cleaned it up and it has been fine since.

Fraccie:
Try getting an aerosol of proper contact cleaner and go through the fuse box and ignition switch. Bit of scotchbrite will help as well.

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