SOHC.co.uk Forums > CB500/550
Original regulator
TrickyMicky:
--- Quote from: Murf on September 04, 2025, 10:54:44 PM ---Thanks, that’s saved me some cash. Just need to get a new fuse box as that has seen quite a lot of heat at some point in its life, with a fair bit of melting around the highest amp fuse holder.
--- End quote ---
When you fit the new fuse box check the terminals inside the remaining half of the multi plug. It's quite common after a few years for the spade type connectors to turn green and create enough resistance for the ends of the fuses to get hot as they try to draw enough current. I had experience of a series of main fuse failures and I kept looking for a short circuit, until I was informed that if it's a 'short', then the fuse wire breaks in the glass, whereas in my case the end od the fuse had got hot enough so the end cap came loose.. Disconnect the battery and have an ejoyable 1/2 hour with a set of jewellers files. Have fun. Mike.
neat street:
Hi Murf, after checking my connectors I found that the `green rust` had eaten in ssome cases half of the spade connectors (its easier to take the connectors out oif the blocks to clean, you can then see as in my case the bits you cant see like the half eaten terminal) so replaced the lot instead of cleaning, this was the safest route for me. its easy to take the terminals out and check.
Murf:
Thanks
The little sub harness that connects everything together is definitely not in a great state and needs work. The wires of the 3 connectors to the regulator all have solder joints in them which look like they are about to break, so think I am going to put complete new wires and connections in to replace them, I have checked the spade connectors and surprisingly they are pretty ok.
It’s definitely worth putting work into this area of the bike as it looked like ‘break down central’ when I removed the plate with it all on.
Thanks Bryanj, I will check out that fuse box as it would be nice to upgrade to spade fuses.
deltarider:
All very interesting, but - as I am lazy - I prefer to perform a V-drop test before beginning tedious chores. If a test informs me V-drop is within limits, I'd abstain from activities not needed.
Sesman:
A v drop test? That might need some further explanation?
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