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CB750 Wiring Issues

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Oddjob:
No I don't think you're understanding it correctly Sean. I can't see a brown/red at all unless that wire coming in from the 7A fuse is the brown red, just looks brown to me on my PC. Either way that fuse get's it's power from the brown/white circuit, (it's an internal connection inside the loom) which is powered by the headlight on/off switch,(which gets it's power from the standard black wire feed on Hondas) the brown/white circuit feeds the bulbs in the speedo/tacho, feeds the ignition switch so it powers the brown wire when the switch is on, which in turn powers the fuse for the rear light and also runs a feed down to the indicator switch so that when the indicators aren't working it powers the running lights the yanks got. As well as of course feeding the main light fuse due to the internal connection.

royhall:
Thanks for all the input to this thread it's been a great help.

I spent two full days almost pulling my hair out with frustration. I had everything functioning but just couldn't turn off the headlight, nor were the lights running through the 7A & 5A fuses. Part of the problem was the brown/white connection going to the 7A headlight fuse (brown/red) was female to female so I ignored it. I went to the lockup and brought back the original harness, it's knackered but still as it was taken off the bike. On the female to female connection was a 50mm long male to male connector, mystery solved. After connecting that, the return from the fuse box black/brown connects to black/brown to the dimmer.

I now have fully and correctly functioning electrics. After two days off and the help you guys gave, the penny dropped straight away. There is no neutral position on the dimmer, no idea what that was all about (the diagram is wrong here, on low it should show brown/green connecting to white). There's only one position on the indicator switch so orange/white and light blue/white remain unused. The brown cable for the buzzer is missing completely, but I don't need to worry about that. I have tested every function on the bike including power to the coils turning on and off with the right hand kill switch. I even turned everything on and removed the fuses one at a time to double check it kills the correct things.

I hope the above explains the situation as it's pretty hard to convey what's going on with electrics, if I missed something just ask. It's all a bit birds nest in the headlamp just now along with some bad connectors. But now it's all connected I will go through it one cable at a time and make everything good. I will be glad when it's all buttoned up and the headlight is on to be honest, it's been a bit frustrating.

Once again thanks for all the help

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taysidedragon:
Good news Roy. Always a relief when things fall into place and work as they should.  :D

Spitfire:
Pictures like that one always look scary to me !

Cheers

Dennis

Johnny4428:
Very well done Roy! I remember when I did mine with the new harness, connected up everything and when I activated the left indicator the rear right lit! 🥵🥵 but one by one I got there. Very satisfying when everything works then.

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