Topic: CB750 custom wiring with M-unit questions

[calj737]

By the way, does your gauge have a button on the front bezel for toggling thru the menus and setup? Or does it have a small jack on the backside? If backside, get 2x 3-way M-Switches and wire the extra switch as the MENU button for your gauge (I do this on all MotoG gauges with LCD screens).

[slikwilli420]

So the Red/White from my gauge goes to the AUX OUT side, represented by the Black in the diagram? Then the Black from gauge is ground, Yellow to the Yellow on the coil, and so on.

I believe the button on the front is for toggling through menu items so should not need the 6th button. I will buy a 3 and a 2 to keep the option of signals available.

Where should wiring for the oil gauge tie in? Guessing Red/White from the gauge can follow the same path as for the tach/speedo gauge.

[Johnny340]

Subscribed to this thread...Awesome info!! 
I am planning my wiring using an M-unit with GSXR switches.

[calj737]

The OIL and NEU switches (shown top right, next to the table) are wired directly to a light. That light needs power also since these wires are negative. Use the solid black wire from AUX to provide service.

Your gauge Red and White are tied together to the single Black from AUX.

[calj737]

I am planning my wiring using an M-unit with GSXR switches.

Hmmm. This will take a good deal of fiddling to get right.

[Johnny340]

I am planning my wiring using an M-unit with GSXR switches.

Hmmm. This will take a good deal of fiddling to get right.

Yes, I'm thinking some buttons like 'hazard lights' will be inop and others like high beams could be difficult.  I'm hoping I can call on your expertise when the time comes.  I'll start another thread then.

[slikwilli420]

Cal, this has been really helpful and hopefully others will be able to use this for their machines. I have a horde of wire, shrink tube and nylon sheathing ready for this project. I just need to go out and get the unit and switches, then the fun begins!

[calj737]

I am planning my wiring using an M-unit with GSXR switches.

Hmmm. This will take a good deal of fiddling to get right.

That's part of it. The real issue is the flow of power from stock to the m-unit. With stock controls, the power runs to the handlebar switches, is transferred through them, to the components. With the m-unit, all power comes from the m-unit directly to the component. So in essence, you take stock wires (power supply) and tie them to grind so any switch is actually connecting the ground signal to message the m-unit. Clear as mud?

Yes, I'm thinking some buttons like 'hazard lights' will be inop and others like high beams could be difficult.  I'm hoping I can call on your expertise when the time comes.  I'll start another thread then.

[Johnny340]

That's part of it. The real issue is the flow of power from stock to the m-unit. With stock controls, the power runs to the handlebar switches, is transferred through them, to the components. With the m-unit, all power comes from the m-unit directly to the component. So in essence, you take stock wires (power supply) and tie them to grind so any switch is actually connecting the ground signal to message the m-unit. Clear as mud?

I think I understand.  So we could utilize stock switches to send the signals (via grounding though) to the m-unit which in turn powers the specific circuit.  I'm still not sure how the high beam signal would work since the m-unit only has one headlight input.

[calj737]

The m-unit has a built-in function to toggle between HI and LO. So your switch will signal the m-unit to switch the headlight.

[Johnny340]

The m-unit has a built-in function to toggle between HI and LO. So your switch will signal the m-unit to switch the headlight.

So, any momentary ground will alternate high/low? Or could that GSXR high beam switch somehow change to high beam simply when selected on (non-mometary)?

Side note Cal...I gotta ask, with 737 in your user name, are you in aviation?

[calj737]

It can be done with the stock GSXR controls. Part of running the m-unit is configuring the unit when you use non-momentary switches.

Nothing to do with aviation 

[Johnny340]

It can be done with the stock GSXR controls. Part of running the m-unit is configuring the unit when you use non-momentary switches.

Nothing to do with aviation 

OK great!  I see that wink and I call BS...haha
Anyway, I'll stop thread jacking now.  I hope to hear from you when I get my M-unit (which I will now that I know my switches will work) and I start my own thread.  Cheers, John

[540nova]

The M-unit is a beautiful piece of engineering, and anyone can wire them. I successfully wired mine with a couple questions to Cal when I had issues. But if you take it slow, one circuit at a time it all makes sense.


1974 CB450, 2006 CBR1000RR

[slikwilli420]

Cal, in the lower right, the box with the loops and two circles, that is the starter solenoid right? That and the M in the circle is the last part of the diagram I am trying to make sense of. Im guessing its the solenoid and starter motor.

[calj737]

Correct

[slikwilli420]

Cal, now that I am wiring I have a few more questions. From the solenoid the Y/R goes to start out on the m unit. What do I do with the G/R wire that goes from the solenoid to the Silicon and to the clutch switch? Can I ditch that or should I just keep it?

Must RR also has three yellow, one red, and one green going to a plug. I assume I would sub my red wire in for the white on your diagram right? The other two wires coming from the RR are black and white. Assuming black goes to AUX out and white goes to the battery.

Lastly on the wiring for the m lock it shows a fuse between it and the battery. The instructions say a 1A fuse. Do you typically just use a blade fuse holder there?

[calj737]

Solenoid G/R goes to ground (its you Neutral wire, by the way)

Swap Red and White around on the diagram as you suspected.

The m-Lock usually is shipped with a fuse holder. If not you can use a blade type if you'd like.