Author Topic: M-unit Blue wiring help  (Read 33716 times)

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Offline E

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M-unit Blue wiring help
« on: October 21, 2017, 10:29:41 pm »
I'm close to completing the build on my 1976 Honda CB550F and need some advise on wiring the Motogadget M-unit Blue. Has anyone successfully run the new M-unit Blue on a CB550? I've attached a diagram for reference. Any help would be much appreciated :)

GearHeadGal32

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Re: M-unit Blue wiring help
« Reply #1 on: October 22, 2017, 07:11:22 am »
Hey Toi
Ive been doing my research and I havent found any videos on how to install on a cb550 but I have found some videos that might help you better understand how install on a motorcycle.

First is Revival Cycles. They go pretty in depth on how the m unit blue works and how to hook up all the wirings

Then theres Saturday's Wrench who does an original m unit on a cb350. Not exactly what youre looking for but the same style/model bike.

Hope this helps a little!

Offline calj737

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Re: M-unit Blue wiring help
« Reply #2 on: October 22, 2017, 08:54:36 am »
The “Blue” unit doesn’t differ really from the original in terms of how it’s wired. There’s different ports and some added functionality due to the Bluetooth features. What matters most is what switch controls you’re using and what gauge/instrumentation for how to service those from the m-unit.

Care to provide those answers? Also your diagram didn’t link-
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Offline E

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Re: M-unit Blue wiring help
« Reply #3 on: October 23, 2017, 01:00:33 am »
Watched those videos a while back but still lost as to which wires to connect on the m-unit blue and the bikes ignition and charging system.

I have the following on the CB550;
- Motogadget M-Unit Blue
- Antigravity 8 Cell battery
- Magna 5 ohm Coils
- Delphi Metric fuse holder
- Ricks Reg/Rec
- Universal starter relay solenoid with fuse
- Emgo key ignition
- Reproduction CB550 left and right control switches

Diagram below. If someone could please complete the connection below that would be great :) I want to ensure I don't destroy the electronics or the bike on first startup. After this I will start with the accessories i.e lights.






Thanks

Offline calj737

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Re: M-unit Blue wiring help
« Reply #4 on: October 23, 2017, 03:41:59 am »
This will be close except the switch controls in the attached are based upon using L and R control switches. Your report switch needs a diagram from the manufacturer so we know what wire color performs what function. Are you not using a R side control? What about dash lights or gauges?
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline E

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Re: M-unit Blue wiring help
« Reply #5 on: November 16, 2017, 10:52:18 am »
Can someone please advise if the wiring below is correct for the ignition and charging system?


http://i1242.photobucket.com/albums/gg525/eF1LMS/wiring.jpg

Thanks

Offline calj737

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Re: M-unit Blue wiring help
« Reply #6 on: November 16, 2017, 12:20:32 pm »
Link is dead.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline E

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Re: M-unit Blue wiring help
« Reply #7 on: November 16, 2017, 05:44:04 pm »
Sorry, link below.

https://imgur.com/a/p2aLe

Offline calj737

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Re: M-unit Blue wiring help
« Reply #8 on: November 16, 2017, 11:35:22 pm »
Its fine, BUT, I'd strongly suggest you change the wire color of BLACK that you have running to GROUND to solid GREEN. That is the stock coloring, and within your diagram you have some BLACK as switched 12v, and some as GROUND. That is a recipe for disaster and burned components.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline cb_n00b

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Re: M-unit Blue wiring help
« Reply #9 on: November 17, 2017, 11:36:48 am »
I have an m-unit blue on my '77 CB550; it's money very well spent - I love it.

I can't really help you out as I had some professionals wire it up for me as it was way above my pay grade and I was likely to do more harm than good...That said, I've learned a lot about these things from cal, definitely take his advice.
1977 CB550K
- MotoGP Werks Exhaust / Stock Airbox
- Dyna S Ignition & Coils
- Motogadget M-Unit Blue
- 069A CB550F Carbs
- Beringer front brake kit

Offline E

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Re: M-unit Blue wiring help
« Reply #10 on: November 23, 2017, 10:07:20 pm »
Thanks All. Another version of the diagram below. I'm not sure about the black wires on each coil and the 'accessory' terminal on my key ignition (see below).


Offline calj737

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Re: M-unit Blue wiring help
« Reply #11 on: November 24, 2017, 01:51:42 am »
BLACK from coil runs to IGN on m-unit. BLACK from ACC on your key switch gets abandoned.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline E

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Re: M-unit Blue wiring help
« Reply #12 on: November 24, 2017, 08:21:27 pm »
Thanks calj737. Appreciate the assistance. It's hard to find a local (Melbourne, Australia) motorcycle shop or electrician willing to tackle the wiring so I'm left to do it on my own.

Below is an updated diagram with a few changes.

- Black wire from each coil has been directed to the 'ignition' terminal on the m-unit blue.
- The starter solenoid goes straight to battery.
- Rectifier/Regulator goes straight to battery.
- The black wire on the rectifier/regulator goes to the 'ignition' terminal on my key switch.

Is this alright?

Also, will I need to add a relay to the key switch? If so how do i go about doing this?


Offline calj737

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Re: M-unit Blue wiring help
« Reply #13 on: November 25, 2017, 03:00:35 am »
The BLACK from key to Reg/Rec is unnecessary. Simply run it to LOCK on the m-unit.
A relay for the key switch is optional. What amps is that switch rated for?
You only need one leg of the START to wire to the solenoid, not both.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline E

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Re: M-unit Blue wiring help
« Reply #14 on: November 25, 2017, 11:03:07 am »
I believe the black wire on the rec/reg is the sensor feed and needs to be connected somewhere that has +12DC source after the ignition is switched 'on'. Where's the best place to connect this to? I see with the previous version of the munit ppl would connect this to 'aux' but this version has no 'aux' on the munit?

Its a 3 way universal ignition switch (12V DC). Would adding a fuse to the red wire on this switch be sufficient?
https://www.thirdgear.com.au/universal-3-way-ignition-switch/

Offline calj737

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Re: M-unit Blue wiring help
« Reply #15 on: November 25, 2017, 01:58:53 pm »
Key BLACK and Reg/Rec BLACK both go to LOCK. That port is switched 12vdc with the key to ON.

A fuse between key RED and battery POS is not needed, but a relay can deal with high amps if the switch is lowly rated.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline E

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Re: M-unit Blue wiring help
« Reply #16 on: November 25, 2017, 04:21:20 pm »
How would I wire a relay to the key ingnition switch using my diagram above?

Offline E

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Re: M-unit Blue wiring help
« Reply #17 on: December 01, 2017, 02:47:06 am »
Thanks Cal! Here's my completed diagram for the CB550F. All that's left is connecting the power to the gauges and oil/netural sensors, which input can I use on the m-unit blue to power the gauges? Aux1? if so, will I need to add a aux input if I do i.e button or I can simply set Aux1 to power on startup?



Let me know if there's something in my wiring that shouldn't be there.

Thanks :)

Offline calj737

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Re: M-unit Blue wiring help
« Reply #18 on: December 01, 2017, 03:29:56 am »
Yes, you provide power to the gauge backlights (speedo and tach) from AUX.
You bring the stock Gr/R wire to the GROUND input for NEUTRAL, and power it from AUX (your PURPLE)
You bring the stock Bl/R wire to the GROUND input for OIL, and power it from AUX (your LtBl)

On the speedo, the INDICATOR input gets a tap from each TURN L and TURN R, but you will require the use of an inline diode on those inputs to prevent the current from bleeding over through the gauge. Unless you plan to abandon the use of that dash light?

I see you added a 1 amp fuse for the key? Is that the full rating of that switch? That's wicked low...

Several folks who have installed those mini gauges have found the backlight to be VERY bright, and have thus used a resistor to dampen the intensity of the light. You might power them up in the garage at night, and see how you feel about their glow.

The only thing that catches my eye is the double output tap for START. Since I haven't played with an M-Blue personally, is that a new recommendation in the current manual? I'll download and read it this weekend while I fly  ???
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline dave500

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Re: M-unit Blue wiring help
« Reply #19 on: December 01, 2017, 04:29:02 am »
#$%*ing hell just ride your bike!whats with the gadgets?

Offline E

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Re: M-unit Blue wiring help
« Reply #20 on: December 01, 2017, 11:45:15 am »
Soon :)

Offline E

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Re: M-unit Blue wiring help
« Reply #21 on: December 01, 2017, 11:58:28 am »
Here's the final with the gauges connected.

Speed Gauge with lights:
BACK LIGHT:
(+) to aux output
(-) to ground

HI BEAM:
(+) to aux output on m-unit
(-) to HI output on m-unit

NEUTRAL:
(+) to aux output on m-unit
(-) to stock Gr/R wire on Alt

OIL:
(+) to aux output on m-unit
(-) to stock Bl/R wire on Alt

WINKER:
(+) to aux output on m-unit
(-) through diodes to indicator outputs on munit



Also, I was advised all I needed was a 1amp fuse for the key witch and below is a diagram from the manual regarding the 'Start' output for Blue. So I will only require one of the outputs for the CB550?


Offline calj737

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Re: M-unit Blue wiring help
« Reply #22 on: December 01, 2017, 02:37:44 pm »
Here's the final with the gauges connected. Nope, not yet...

Speed Gauge with lights:
BACK LIGHT:
(+) to aux output
(-) to ground

HI BEAM:
(+) tap from HI output of m-unit
(-) to ground

NEUTRAL:
(+) to aux output on m-unit
(-) to stock Gr/R wire on Alt Actually, this wire comes from NEU switch, its just in the Altenator wire bundle. Easy mistake to make.

OIL:
(+) to aux output on m-unit
(-) to stock Bl/R wire on Alt Same as above with NEU, this comes from OIL pressure switch under shift cover...

WINKER:
(+) from TURN L & R output of m-unit, through diodes, into gauge
(-)  to ground

So I will only require one of the outputs for the CB550? Correct. Just one tap from START to solenoid.
Fix these things, then you can satisfy Dave...
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline dave500

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Re: M-unit Blue wiring help
« Reply #23 on: December 01, 2017, 11:21:46 pm »
 ;D

Offline Encierros

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Re: M-unit Blue wiring help
« Reply #24 on: August 29, 2018, 10:28:41 am »
I'm working through my own ignition issues on my cb750 build. (No spark.) I came across this old post while I was searching for answers.

Attached is an edited JPEG of the originally posted Motogadget 8.8.1 diagram.

Is this what the wiring should look like for a CB750 with two coils?