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Author Topic: Regulator wiring help for use with Motogadget M-unit. Please Help.  (Read 11304 times)

Offline Sonreir

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I don't think the starter relay is a good place for that black wire.  The starter relay only has power from the battery or from the starter button.

You want something that has power as soon as the ignition switch it turned on.
Sparck Moto - http://www.sparckmoto.com

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1976 Puch Maxi - APuchalypse Now
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Offline Sonreir

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Actually... orange wire to the relay might work.

I'd still look for a spare black, though.  That's where it's supposed to go...
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
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Offline Snickare

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Thank you for the input.  But the suggestions have no correlation to the wiring of the m-unit...  The starter relay is the only switched place for it to go to... there is no Orange wire, and there are no other black wires.  Remember, it's a custom wire harness...
www.ToddCreatedWood.com
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Offline Sonreir

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Thank you for the input.  But the suggestions have no correlation to the wiring of the m-unit...  The starter relay is the only switched place for it to go to... there is no Orange wire, and there are no other black wires.  Remember, it's a custom wire harness...

I don't think we're talking about the same thing here.

Where is the starter relay getting power from?
« Last Edit: Jul 18, 2013, 15:54:31 by Sonreir »
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
The starter relay/solenoid gets power from the Battery....  The battery also goes straight to the m-unit and in turn sends a signal to the starter relay to 'start' the motor.
www.ToddCreatedWood.com
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Offline Sonreir

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Exactly.  So that's not a good source for the black.  You're either stuck wiring it on the battery side so that it's on all the time or it's only getting momentary power when you're pressing the start button.

You need a source that's on when the key is switched on.
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
Here is a quick representation of my relay. 

+B              -M

Red   I  Green
-------------------
R/W   I   Black
     (Fuse)

Red is from the start button on the m-unit.  R/W is the Red/White from the Regulator/Rectifier.  Green goes to ground.  And the Black is the million dollar wire in question from the RR...

I checked the continuity between the Battery + and the location of the R/W.  It showed that even with the motor off but key on, there was a loop.  then i checked the same between where the Black is and the Battery -, there was also a good loop.  Wouldn't this suggest that with the key on, and the motor running, that the RR is charging the battery and pushing power to the rest of the system?  There is no continuity between the R/W location and the Black location on the Relay.

I've been all around my neighborhood today several times so far, and there have been no power failures.  The battery sounds strong when starting the motor, and the bike is running very nicely.  Is there any reason that I shouldn't leave it there?
www.ToddCreatedWood.com
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Offline SONIC.

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All you need to do is find a wire that when the key is off reads 0 V to ground, and when the key is on the same wire reads 12.x V to ground. Then connect your black wire to that.

What sonreir is saying is that the starter relay is always 12 V, whether the key is on or off. Meaning that your alternator will always be pulling power for the electromagnet. Which probably wont drain the battery in a few hours, but let it sit for a week and youll come back to a dead bike.

And you do really nice (wood) work.

Offline Snickare

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I need to double check that then.  Thank you for the clarification.  I'll go out now and look to see what those wires read.
Thanks for the kind words on my work too.  I'll be posting pics of this very custom CB750 I just made on my blog.  if you're interested please take a look. 

Assuming this electrical issue is solved, I'm taking it in to get the carbs synced tomorrow.  And then that should be the end of it...  (knock on wood).
www.ToddCreatedWood.com
ToddCreatedWood.blogspot.com

Offline Rich Ard

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And you do really nice (wood) work.

Just followed that link - now very much looking forward to seeing this bike. You're a hell of a woodworker.
unplug the connectors from the harness and multimeter the shit out of them

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