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Author Topic: M-Unit Blue V.2 1980 CB750k Starter/ Ignition Help  (Read 432 times)

Offline Racethepilot

  • Posts: 4
M-Unit Blue V.2 1980 CB750k Starter/ Ignition Help
« on: Apr 13, 2019, 23:27:11 »
Hey Crew,

Recently installed the M-Unit Blue on my bike (1980 CB750k) and I can’t get the starter to turn over.  All turn signals, lights, etc work but I’m stuck on the starter.  I have attached a picture of my wiring diagram and need to know what I did wrong.  The Green/ Red wire is where I think my issues are.  When I leave it disconnected the motor won’t turn.  When I connect it to ground and hit the start button, the M-Unit flashes all of its lights and resets. Please Help!!!

Offline aglutsch

  • Posts: 2
Re: M-Unit Blue V.2 1980 CB750k Starter/ Ignition Help
« Reply #1 on: Apr 14, 2019, 10:39:51 »
I have this setup on my 1981 CB750c I can let you know as soon as I get out of work today.

Offline aglutsch

  • Posts: 2
Re: M-Unit Blue V.2 1980 CB750k Starter/ Ignition Help
« Reply #2 on: Apr 14, 2019, 20:12:32 »
The red/ green should be grounded to the frame and The Red/ yellow needs an additional wire spliced into it so it goes into the other starter input on the m-unit. Hope this helps.

Offline Sonreir

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Re: M-Unit Blue V.2 1980 CB750k Starter/ Ignition Help
« Reply #3 on: Apr 15, 2019, 12:03:37 »
How do you have the start button wired?
Sparck Moto - http://www.sparckmoto.com

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Offline Racethepilot

  • Posts: 4
Re: M-Unit Blue V.2 1980 CB750k Starter/ Ignition Help
« Reply #4 on: Apr 24, 2019, 21:19:20 »
So just got back and wired it exactly like you specified, two starter wires spliced together (yellow/red) leading to the starter solenoid and I grounded the (green red) wire.  When I hit the starter button the m unit made a spark noise and all of the lights on the unit cane on.  Any idea what I did wrong here?

Offline Racethepilot

  • Posts: 4
Re: M-Unit Blue V.2 1980 CB750k Starter/ Ignition Help
« Reply #5 on: Apr 24, 2019, 21:21:21 »
Starter button is a motogadget m switch.  I’m running the m button so the blue wire runs to one switch terminal and the other terminal has a wire that runs to the main ground

Offline Sonreir

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Re: M-Unit Blue V.2 1980 CB750k Starter/ Ignition Help
« Reply #6 on: Apr 24, 2019, 23:54:40 »
How about if you bypass the switch and ground the START input 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 Racethepilot

  • Posts: 4
Re: M-Unit Blue V.2 1980 CB750k Starter/ Ignition Help
« Reply #7 on: Apr 25, 2019, 00:04:40 »
Tried that too.  When I bypass the switch the same thing happens where the m unit makes a spark noise and all the lights on the unit flash on then immediately the unit turn off. 

Offline Sonreir

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Re: M-Unit Blue V.2 1980 CB750k Starter/ Ignition Help
« Reply #8 on: Apr 25, 2019, 02:08:08 »
Got a multimeter? What's the resistance between the yellow/red and green/red wires from the solenoid (with the wires disconnected from the rest of the system)?
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