SOHC.co.uk Forums > CB350/400

Headlight problem.

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Bryanj:
Dont just "look" what frequently happens is the contact at the clips gets weak and overheats which melts the solder holding the fuse element to the cap so it looks good but aint. The heat alst tends to melt the plasticbody of the fusebox which makes it worse.
A member on the US site makes direct replacement blade fuse replacements but you can do your own

Bradders:
The fuse had blown so changed it with the spare. Headlight now works. Thanks very much for all of your advice. Am I right in thinking though that there must be a reason/ problem as to why it blew in the first place?

Deano400:
It could be something or nothing.
It could be age related if it’s the original fuse. The original spec for the head light bulb was 50/35w. So that the head light doesn’t flick off during the transition from Low to High and High to Low both High and Low beams would be on for the short transition period. This would draw 7A during transition so I guess a 7A fuse over time would weaken and give up.
Any dirty / poor connection / earths would also increase the load and therefore the current.
I would check and clean the connections as there aren’t many.
Also check the rating of the bulb is as specified.
My brother had issues with his 400 and after stripping and cleaning the ignition switch connector everything was great.

Bradders:
Thanks for the info Deano, I will buy some new fuses from Silvers and try that first I think.

TrickyMicky:
As stated by others, we tend to sometimes forget the actual age of our steeds. When I had a fuse problem, I was advised to detach the fuse unit and check the multi-plug behind it. Lo and behold, all the internal connectors were a wondrous shade of green! Remembering to disconnect the battery first(!) I set about them with a miniature set of jewellers files until they were restored back to nice shiny brass finish. Problem solved, at least for the last 3 years or so. Also, as it's out of sight, I tightly wrapped the connector in Insulating tape to keep the worst of our beautiful English climate at bay.

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