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Wiring my CB550F2 from 1978

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alexdecker:
Hey

Got to the last chapter of my rebuild for now, which is the wiring. I thought I would try and contain all the questions in this thread and hope for all of your help once again.

It is still the original wiring loom, but with changes here and there. From what I can see from the diagrams, it is basically a question of matching the colors up and plug in all the wires. The switches go down to the little black box under the coils, and the gauges go to the head light together with the front signal lights.

I took a picture of the wires from the start/kill switch, as it seems that it has been rewired. The colors don't match up at all to me.

How can I go about testing what wire does what? Any tips and tricks?

Bryanj:
2 wires go to the kill switch, should be black plus black/white.
Need to know what wires go to start button and what colour

Does it have lights on/off?

alexdecker:
Yes, light on/off! Problem is there are three black wires in this thing. And other colors that doesn't match anything in the diagram. Is it a matter of joining wires and measuring connections with a multimeter, or?

Bryanj:
Open it up and tell me what colour wires go to start button and what to light switcg, is this just on/off or off/park/headlamp?

alexdecker:
I have the version with off/park/headlamp.

I opened it up and now know which wires go from where. There are 8 wires coming out of the switch. I have made a small diagram of the whole thing. I have a few questions though:

1. I connected the RH switch where the wiring seems to be original, except for a single wire. I don’t have a brown/white wire coming out of the switch, and neither do I have a brown/white wire to connect it to in the harness in the black box under the tank. I do have a spare black wire coming out of the RH switch though, which I don’t know what is for.

2. Is the switches grounded to the handlebar through screws? Otherwise that black wire could be ground maybe?

3. I don’t have nearly enough wires in the harness under the tank for the LH switch though. I have attached a picture of the remaining wires. 

4. I don’t have position light wires coming out of my signal lights - that is why those cables are still free in the picture of the remaining wires (orange white and light blue white).

5. Also, I seem to have a double GROUND under the tank I can’t find in the wiring diagram. It seems to go unused?

Does any of this makes sense to you? I am using the model F wiring diagram, so it should fit my model?

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