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Author Topic: Regulator wiring help for use with Motogadget M-unit. Please Help.  (Read 11303 times)

Offline johnson_steve

  • Posts: 351
For sure you have it hooked up right; idk what they meant by positive  ground  as the diagram you posted clearly shows negative to be ground. The black wire going to the reg/rect is not negative (i know confusing right?) The regulator uses this wire to sense the battery voltage (positive) so it knows how much juice to make.

Offline Snickare

  • Posts: 65
For sure you have it hooked up right; idk what they meant by positive  ground  as the diagram you posted clearly shows negative to be ground. The black wire going to the reg/rect is not negative (i know confusing right?) The regulator uses this wire to sense the battery voltage (positive) so it knows how much juice to make.


I appreciate the clarification.  It makes me feel better about how it's hooked up. 
The positive ground that it mentions is simple.  The rest of all the wires go from the m-unit to a frame ground- negative...  But the lock/ignition goes from the m-unit and back to the positive.  Take a look at the lock on the diagram I posted. 
However what you have said twice now, makes perfect sense and is exactly in line with the positive ground that the lock works off of.  For not knowing electrical, and not being so great with it.  The m-unit was really easy to install. 

Thanks
www.ToddCreatedWood.com
ToddCreatedWood.blogspot.com

Offline Rich Ard

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I think the point is that what you're taking about is not a positive ground. :)
unplug the connectors from the harness and multimeter the shit out of them

Bad Points, a comic :: CB450 Restomod (sold) :: Viragostrosity :: GL1000 daily rider :: Kaw 175

Offline SONIC.

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I think the point is that what you're taking about is not a positive ground. :)

yeah, I'd call it a "switch"

Offline Snickare

  • Posts: 65
Yeah.  That's just what they call it in the manual, as it's going to positive, instead of negative....

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Offline DaxAms

  • Posts: 1
Hi Todd,

Thanks for keeping this thread so informative throughout the pages by updating all of your thoughts and finding! I rode my CB750F '81 rebuilt cafe racer for the first time yesterday after making a new wire harness with m-unit and ran into the exact same problem.

Luckily I kept my home-made wire diagram which showed I did nothing with the black R/R wire, so I am going to hook it up to my Lock input this evening. Did you splice in the wire into the lock input wire or did you combine them in the connector at the terminal?

Again, thank you for helping someone 4 years later!

Cheers,

Dax

Offline Snickare

  • Posts: 65
Dax,  I don't really recall exactly how I ended up fixing the issue I had, but I do have the final diagram that I made for the bike and the harness I designed around the M-Unit.  I'll post it here as an attachment.  I also never just stuck wires into the terminals of the M-Unit, but instead would use these crimp on pins that would go into the terminals, sometimes I would have more than one wire per pin though.  I hope this helps.

Todd


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Offline bruders8146

  • Posts: 20
Sorry to bring up an old post.

But I'm just about to tackle this whole process.
Building a new harness and just wanted to know if you have any tips that I would find helpful?

Many thanks

Sent from my SM-G955F using Tapatalk


Hey man, I have just finished wiring up my bike (1980 CB900F), I ran into the same problem with the black wire from the reg/rec and ended up running it to the AUX on the M-Unit as its a switched 12V source and I don't have a key ignition anymore because im using the M-Lock.
I butchered a wiring diagram I found online and tried to make it reflect what I have done on the bike, mainly so I could track down where I messed up because the bike is not charging the battery. Here is the link to the page I put it up on.

http://www.dotheton.com/forum/index.php?topic=75073.msg892440#new

I just got the battery tested and it has dropped a cell, Im going to get a new battery tommoz and chuck it in and fire up the bike and see if its charging. If its not then that wire diagram will prob have to change because I must have done something wrong!
A knight in shining armour is a man who has never had his metal truly tested.