Topic: Motogadget m-unit help!!!

[SOHC4 Cafe Racer Fan]

I'm doing m-button, unit and lock with modern controls.

[Restoration Fan]

I just need a good, free, electronic drawing package to document the 3 different layouts: 750/550 stock controls with new R/R, 750/550 with m-button, and of course these with m-LOCK/aftermarket controls.

May not be everything you need, Cal, but Google Sketchup is free and is a pretty good 3D modeling tool.

[calj737]

I apologize for bringing up a old post, but I just got a m-unit for my 78 cb550k. 

Starting with the key switch- I have 2 brown/white wires, a red and a black wire.  Black goes to lock? does red go to aux? Can I remove the 2 brown?

I am using the stock start button for the time being- the yellow/red goes to start out? What do I need to do with the green/red?

No! From key switch:
RED to battery POS
BLACK to LOCK
BROWN&BR/WHITE are abandoned.

AUX provides switched 12v power to your bike, replacing stock Honda BLACK. Use AUX to run 1 service leg forward and 1 service leg rearward. From the rearward leg, power your license plate lights if they are separate from the Taillights.

The forward run from AUX powers the coils, gauge backlights, and the runs to your KILL switch.

The Start button YELLOW/RED goes to START input on the m-unit. The START output goes to the solenoid. The GREEN/RED is your Neutral light and goes to your gauge.

Consider the left side of the m-unit as "input" and the right side as "switched 12v output". Each function is individually fused. When you press the stock Turn L button, it sends a ground to the m-unit, then the power is transferred to the right side, then the indicator. If you had wired RED to AUX: 1- you'd have not battery power to BLACK from the key and LOCK would not activate the m-unit. 2- if the m-unit were activated by LOCK, then AUX having 12v put back into it, would likely damage the unit badly.

[calj737]

I just need a good, free, electronic drawing package to document the 3 different layouts: 750/550 stock controls with new R/R, 750/550 with m-button, and of course these with m-LOCK/aftermarket controls.

May not be everything you need, Cal, but Google Sketchup is free and is a pretty good 3D modeling tool.

I know Sketch-up. It's a 3D tool, not an electrical diagraming product. I already have AutoCAD, Inventor, and AutoStudio. I found ProfiCAD for electrical. Works well, and been using it to help some guys with their MotoGadget stuff.

[tbk125]

Thank you so much for the help!  So from my ignition coils what wires should I have going where?

[calj737]

Thank you so much for the help!  So from my ignition coils what wires should I have going where?

Why don't you PM me. Easier for me to help you that way-

[timrwhi]

Thank you so much for the help!  So from my ignition coils what wires should I have going where?

I had the same question actually... from the coils, it seems like the yellow wire and blue wire would connect to their counterparts on the condensers? And the white/black wires on the coils connect to AUX?

[calj737]

Thank you so much for the help!  So from my ignition coils what wires should I have going where?

I had the same question actually... from the coils, it seems like the yellow wire and blue wire would connect to their counterparts on the condensers? And the white/black wires on the coils connect to AUX?

AUX feeds the ignition coils. You can either run AUX to the KILL switch, then to the coils, and YELLOW/RED from start button to START input. START output to solenoid. The BLUE and YELLOW from the points plate or electronic ignition run to the coils as stock.

[timrwhi]

Thanks for all your advice in this thread, Cal. I skipped the kill switch and just push the start button twice while the engine is running to cut power. Really nice feature. Here is how I wired up my components in case it's helpful (attachment)

[boyt666]

hello,

i'm owner of a cb 500 an also used a motogadget m-unit with universal reg-rec .

I first followed the instructions to connect the sense + wire to lock ( in ) but I had a bad charge ; secondly I ' ve tried it to connect it to the aux output and al troubles seem gone.

It was a small drop of power ( +- 0.3 V / trip ) but now I ' ve measured 12.9 volts after a ride , so I don't thinks thas bad , strange the connection between lock and aux ...

This answer is just to hear if anyone else had the same issue ...

exept from the generator ( dynamo ) is everything new .

kind regards from Belgium ....

[calj737]

@boyt - detecting a difference in voltage at LOCK and AUX is perfectly expected. In LOCK, you are detecting the voltage status of the Ignition wire coming from the key switch. At AUX, you are detecting the normalized output voltage of the m-unit. It would be safer to use AUX if you are running a Lithium style battery as the variance in voltages applied to the battery by the Reg/Rec is more accurate. Better to not "overcharge" the battery.

I find the best way to alleviate the voltage drop is to use the m-Lock module. Then, you have no wiring or switches between POS and LOCK.

[boyt666]

Thanks for the info  !

Yes it's a lithium battery and I can check also the health of it with a charge system, it only needed less than a hour to be full charged, a week ago it  discharged before a new charge session started and the process took a whole night.
But I'm happy to get rid of the old reg rec units, real antique but they still did the job.... I already have questions about the right sided clutch ln my cb 500 , the gasket between engine and clutch cover don't match at the base side. Engine gearbox is flat and clutch cover has a small curve.

[Jms88278]

This was super helpful. Thanks Cal.

[calj737]

 

[Ellz10]

Thank you so much for the help!  So from my ignition coils what wires should I have going where?

I had the same question actually... from the coils, it seems like the yellow wire and blue wire would connect to their counterparts on the condensers? And the white/black wires on the coils connect to AUX?

AUX feeds the ignition coils. You can either run AUX to the KILL switch, then to the coils, and YELLOW/RED from start button to START input. START output to solenoid. The BLUE and YELLOW from the points plate or electronic ignition run to the coils as stock.

I thought that the coil wires (not blue & yellow) run to IGNITION on the m.Unit?? That's what you told me before.

[calj737]

Sheesh. You don’t pay much attention to what you are told. The coils have 2 separate wire sources: 1 is actual switched power (from the mUnit) nd the other is the from the ignition plate (blue or yellow as signals for the coil to fire the spark plug).

AUX feeds 12v power to the coil. Blue/Yellow tell the coil to fire the plug in time with the valve train and ignition.

[Ellz10]

Sheesh. You don’t pay much attention to what you are told. The coils have 2 separate wire sources: 1 is actual switched power (from the mUnit) nd the other is the from the ignition plate (blue or yellow as signals for the coil to fire the spark plug).

AUX feeds 12v power to the coil. Blue/Yellow tell the coil to fire the plug in time with the valve train and ignition.

I do pay attention to what you say, which is why I'm confused. I'm trying to learn from you because you're more knowledgeable than me. You say "COIL to AUX in one post, but then I read you saying COIL to IGN On another.

I mean no disrespect AT ALL; I just want to know which one is correct.

[calj737]

You say "COIL to AUX in one post, but then I read you saying COIL to IGN On another.

I mean no disrespect AT ALL; I just want to know which one is correct.

Both are. It lol depends which mUnit model you are using. In v2, there was no IGN only AUX. but it really doesn’t matter because both ports do the same thing; they deliver switched 12v.

But the issue at hand that in your prior post was your confusion about the BLUE and YELLOW wires from the ignition plate to the coils. It took 5 different posts to get you straight on the Reg/Rec wiring.

Wiring a bike from scratch is not hard, but you must take a methodical approach to understanding the basics of an automotive electrical system. Posting “I did this, is it right?” is not a productive method to learning.

[Ellz10]

You say "COIL to AUX in one post, but then I read you saying COIL to IGN On another.

I mean no disrespect AT ALL; I just want to know which one is correct.

Both are. It lol depends which mUnit model you are using. In v2, there was no IGN only AUX. but it really doesn’t matter because both ports do the same thing; they deliver switched 12v.

But the issue at hand that in your prior post was your confusion about the BLUE and YELLOW wires from the ignition plate to the coils. It took 5 different posts to get you straight on the Reg/Rec wiring.

Wiring a bike from scratch is not hard, but you must take a methodical approach to understanding the basics of an automotive electrical system. Posting “I did this, is it right?” is not a productive method to learning.

I wholeheartedly agree with you. I'm trying to do better - I spent the better part of tonight reading thru open/closed circuits, grounding, interference, and a few other things. I want to know everything I can about it.

One thing I was thinking about and couldn't figure out if it would work properly was if I would be okay with connecting the starter cable to battery POS, and then from battery POS to the starter solenoid.

Or does it have to be from starter to starter solenoid, and from battery POS to starter solenoid.

My understanding is that either way would work as that current is being carried and transferred regardless. Am I correct in that assumption?