SOHC.co.uk Forums > CB750

Wiring

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Grumpyfck:

--- Quote from: Bryanj on December 14, 2020, 05:02:47 PM ---1 thats not the starter seitch its the sarter solenoid
2 need to know the colours of wires into the starter switch or button inside the LH handlebar switch

--- End quote ---
I replied to the wrong post 🙄. They called it a starter magnetic switch on the diagram, I have a spare RG right by it so made a mental jump. With check the switch assembly.

Bryanj:
Bit more time now waiting for a muppet to unload 26 pallets.

The early bikes have power to the solenoid which is earthed by the yel/red at the handlebars
Later bikes have 2 wires to the button one black(12v with ignition on) and the yellow red which puts power to the solenoid when button pushed, more complex with US always on lights as at same time it dissconnects lights. This type then earths via the starter safety circuit(neutral light on OR clutch pulled in) the solenoid still has only 2 wires on it and it dont matter which way they go BUT you need to know which you have to avoid shorts

Grumpyfck:
Thanks, I am pretty rubbish at understanding electrics but trying to learn.  The posts were easy enough to follow by the book. Yellow red has what seems to me a straight forward connection.  The black wire was just cut as you see it with no clear connection. (F2 btw) having a RG right there with no apparent use was distracting. I will endeavour to investigate further.

Bryanj:
It is distinctly possible somebody has fitted an early solenoid to your F2 put a test light between the yellow/red and green/red on the loom and see if it lights up with ign on and in neutral, if so thats where you plug the solenoid.

10 min test if in front of me, impossible over the net!!!

Grumpyfck:
I can do that,  cheers. All learning isn't it.

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