SOHC.co.uk Forums > CB350/400

Fuse Box fun and more...

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Athame57:
Another black out early this morning thankfully just down the road from home. I've pulled open the fuse box and the first thing I do is order a new one from DSS. I find 5 Amp fuses where there is supposed to be 7 Amp fuses, and 20 Amp fuse where there is supposed to be a 15 Amp fuse, that's the fuse that blew and left a burn hole in the Fuse box assembly. But had there been a 15 Amp fuse surely it would have plane blown quicker? A fuse blows to stop worse happening does it not, so something somewhere is wrong? Bottom fuse holder is a bit loose.

K2-K6:
Yes, you're right about the 20amp fuse.
The whole idea is that the fuse should be rated below the system it's supplying,  so that the fuse is the weakest component and by overheating it first then it will melt before the wires.

A dead short will usually pop the fuse out quite fast and potentially avoid melting the system at any point.  The combination of a fuse that was 33% above the designed rating and a resistance that has built up slowly would give that heat build up.  So it looks like the problem/resistance is consistently there and needs resolving.  It's possibly why someone has put a higher rate fuse in there,  and thought it fixed.  You'll need to identify this problem to fully correct it.

That starter solenoid in the picture looks pretty grimy,  there may be a route to problems there. It should also have both of the main current terminals covered by that insulator that's slipped down along the left hand wire.  I'd start with cleaning that and all the terminals there first,  then look for any similar details elsewhere as an initial clean up and look round the system to take out any very obvious problems.

Athame57:
I've opted to get a new starter solenoid K2-K6, I've pulled apart and derusted the regulator/box , soaking some of those parts in white vinegar now! Thanks for this!

Seabeowner:
The 15A fuse mounting is often seen overheated and melted, even with 15A fuse fitted. 40 year old tired and corroded contacts and soldered joint at the rear cause high resistance and heat.
Many replace with car type blade fuses.
Hondaman sells a replacement or you could have made your own.
http://sohc4shop.com/catalog/product_info.php?cPath=23&products_id=48

Spenny62:
When my 400/4 went dark, it didn't take me long to work out why.  I wondered why it had half a roll of insulation tape wrapped round it.  I can't decide if this 'temporary' repair was inspired or just plain lazy!

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