SOHC.co.uk Forums > CB500/550
Reg/Rec to m-unit
Dangerousdave999:
--- Quote from: Lobo on February 02, 2015, 02:02:37 AM ---Dave,
You don't state your bike.... assume its a good old 70's Honda?
On these bikes the black wire is an ignition switched live.... ie will be +12v, but only when the ignition is on.
It'll feed many things.... juice to (somewhere) in the starter circuit, the indicator switches, to the brake light switch, the horn circuit... and so on. It'll also supply 12v to the regulator.... which I (think) is your question. So, (and assuming your harness spec) connect this rec/reg black to any black on the Honda. (wouldn't be a bad idea to check first though the bike black is indeed 12v + at ignition ON)
The Hondas were often wired differently, according to model / market & year. Eg on some the stater magnetic switch was earthed by the start button.... and on others it was fed +12v by the start button.
If your bike is the former... then it'll have a nice ignition switched 12v+ to it ... ie that black wire. (magnetic switch connectors likely BLACK & hatched RED/YELLOW)
If your bike is the latter it may have a continuous striped RED/YELLOW to one side of the starter magnetic switch (12V+ from start button) and GREEN off to the clutch switch interlock.
But you mention a GREEN/RED. The only Green/Red wires I can find are to do with the neutral light... and it's entirely plausible your particular Honda uses this as a start interlock. (I don't have such wiring diagrams) ... In which case neither of the starter magnetic connections will do.. Ie you need to find that BLACK.
Finally, it sounds to me that your using the wrong wiring diagram for you particular bike. It's bloody frustrating... been there.
With respect to the m-unit I've no idea.. but did find the below.
Treat all I say with caution... I'm no Honda expert! And I say again, no idea about m-units.
Cheers,
Simon
http://www.dotheton.com/forum/index.php?PHPSESSID=vlu8o2hqkhcfght58h8e930bu3&topic=51398.0
--- End quote ---
Sorry yes its a 1977 CB550 K3 UK bike
I have looked at so many different diagrams I'm loosing track!
The haynes one and a couple online show the black from the regulator going to the starter solenoid.
But as I say it has the Green/Red which links to the kill switch and the clutch switch.
Bryanj:
The K3 SHOULD have the safety interlock and the starter that provides power to the solenoid so no power wires there, also there is a white wire as well as a green wirs going to the generator field, without the full specs and diagram for the reg/rec you have i cannot comment further only to say be very careful as ifyou connect it wrongly, even for a split second, the electronics will be fubared
Lobo:
Dave, and standing by to be corrected by folk with genuine hands-on experience.. Bryan etc
The earlier Hondas did not have the start interlock, and were more likely wired as per the top pic, ie the starter switch simply grounding the starter solenoid... which was fed with +12v from the ignition (Black wire). This is what you were hoping for; your manuals suggest - but alas hasn't transpired.
I'm guessing your (later) Honda is wired as per the lower diagram... in that the starter switch now feeds 12v to the starter relay ONLY when you press it. The other side of the starter relay is grounded... but only when the clutch is pulled in to complete the circuit. Bottom line, there is NEVER a 'permanent' (ie ignition switched) live supply at the starter relay. (as borne out by the lack of a black wire)
If your bike IS per the lower diagram, you'll need to go elsewhere for this live feed to your rec/ reg unit and basically any black wire in the loom should do. As I suggested earlier though, do first check it is indeed +12v at ignition ON.
Please appreciate Bryan's comments re frying your m-unit... all my guff above is basic Honda... I have not considered any inclusion of this 'm-unit'
Surely the manufacturer can give specific guidance?
Simon
Dangerousdave999:
--- Quote from: JustcallmeMrT on February 01, 2015, 09:26:47 PM ---I'll be watching so I know when I wire mine... A ways off yet.
--- End quote ---
Thanks for everyone's help.
Figured it out that the black wire from the reg/rec unit goes into the lock port on the m-unit to power the switching function.
Good luck with your's Mr T! any questions give me a shout.
David
Lobo:
Glad it's sorted Dave...
I barely know what an m-unit is... can you enlighten me / us, what 'advantages' etc is it giving you on an old SOHC?
Not knocking it at all.... it's simply new to me!
Simon
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