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Author Topic: Regulator wiring help for use with Motogadget M-unit. Please Help.  (Read 10785 times)

Offline Snickare

  • Posts: 65
So, I've bought and wired a Motogadget m-unit into a custom wiring harness for my 1982 CB750.  Here's my problem though.  However good I am at researching and figuring out problems, this is eluding me.  The black wire on the R/R goes to where? 

I've gotten the bike to start up fine, and run fine, but it's obviously not charging the battery, as it has run down after several starts and will not start the bike any longer.  I'm sure it's the black wire I need to do something with, but I'm not sure where to put it... 
I need some help from someone that know electrical.  Anyone able to offer some advice?  I can provide a wire diagram if needed.  or describe what I've done easily.  It's really a pretty simple system to use. 

Thanks
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Offline Worst cb650 ever

  • Posts: 1491
  • You can always get it running with time or money.
Ok, the black wire is often the ground wire if you are using an aftermarket R/R.  What color are the other wires? 

If it is the ground wire, it needs to be attached to the negative terminal on the battery, possibly through the frame, which should be grounded to the battery as well.
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Offline Snickare

  • Posts: 65
I have three wires coming out of my regulator.  Red/white,  Black, and Green.

The Red/White goes to my Starter Relay located on my Starter Solenoid. 

The Green is Grounded.

The Black for now goes nowhere.....
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Offline Snickare

  • Posts: 65
I've done some experimenting.  This is what I've found.  Can anyone verify my work? 

I'm sure there are not many people that are too familiar with the m-unit, but here goes-
I've tied my regulator to the lower two prongs of the starter solenoid.  The red/white goes to the left prong the one that has continuity with the battery post of the solenoid.  Then the black wire from the regulator I connected to the lower right prong in the starter relay. 

My test; I started the bike, removed the positive battery cable, and the bike kept running.  This means the bike is running off of the alternator/ regulator.  When I tried it on my first attempt when the black wire went nowhere, the bike stopped running as the battery's positive cable was removed.  This means as I was running it before, I was only running it off of the battery, hence my problem of draining the battery after several minutes. 

My last concern, is that if the bike is running now off of the regulator/ alternator, when I removed the battery's positive cable, the lights started to dim until I twisted the throttle.  could this mean my regulator is bad?  Or is it just because of the lower idle?  And the regulator only kicks in at higher RPM?

Any thoughts from any electricians out there? 

Thanks
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Offline Worst cb650 ever

  • Posts: 1491
  • You can always get it running with time or money.
So this is not a stock R/R, correct? 

That year of 750 uses an electromagnetic rotor spinning inside the stator for charging, so there has to be power going to the rotor.  The stock R/R has hookups to provide regulated power to the rotor, so it might be easier for you to chase down a stock R/R to avoid having to rewire the whole charging system.  They're also used on the CB900 of that year, so tracking down one shouldn't be too bad. 
DTT Blue (cause Winter is Coming) CB360 Club.

1995 CBR900RR - a winter flip not worth a DTT writeup - Sold

1986 Yamaha SRX600 - mailed to me from California - build coming soon?

1983 VF750F

1976 CB360T

1993 CBR900RR - Sold

1979 CB650 - Sold

Offline Snickare

  • Posts: 65
That's just it.  My charging system IS stock.  It's how it ties into the m-unit that makes the hook up tricky.. 
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Offline Sonreir

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OK... back way up....

The M-Unit doesn't go anywhere near the charging system, so you want to retain stock wiring for the R/R.

All the wires from the R/R should plug into the alternator, with three exception:  The red/white goes to your starter relay (solenoid).  The green wire from the R/R should be grounded against the frame, plugged into another green wire on the harness, or go directly to the negative terminal on your battery (any of those three are acceptable).  Finally, the black wire from the R/R should be plugged into the black wire from the harness (trace it back from the ignition switch if you're having trouble locating it and don't confuse this with the black wires coming from the rear turn signals).
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Offline Snickare

  • Posts: 65
Thanks, but as I stated, the wiring harness for the rest of the bike is based off of the new wiring for the m-unit.  The black wire needs to close the circuit for charging the battery and running the ignition and accessories...  But when you eliminate the rest of the harness where then should the black wire go...? 

I did some testing and it seems that I may have found the right place for it.  But does anyone have any concrete info for what the black wire needs to be tied into?  I dropped it into the starter solenoid and then tested the running of the bike.  With the bike running, I pulled the positive lead from the battery and the bike kept running.  This should mean that the R/R is now in full circle, not to mention adding charge to the battery.  Correct?
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Offline Sonreir

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The black wire needs to go to a switched 12V source.  When the ignition is turned on, black wire needs to have power.  This is the signal wire for the regulator so it knows when to adjust the power running to the alternator (via the white wire).
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline Snickare

  • Posts: 65
Great.  That should mean that by putting it on the relay for the starter, it's switched, and sending power. 

Thank you.  I'm trying it out now.  Gonna run it around the neighborhood and see that it's making power and charging the battery. 
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