As an attempt to contribute something new/different to the forum (I’m an avid reader, but more of a lurker when it comes to posting) I thought I’d share my experience and wiring diagrams for wiring a Motogadget M-Unit along with a few photos of the install as it progresses.
I am part way through my 2nd ground up rebuild of a Tonti Guzzi, currently working on a 850 LeMans Mk2 which had the wiring harness butchered in multiple locations, and even a fire on it at some stage (Regulator or coils I think) - Needless to say it needed a complete new harness. New harnesses are available and of excellent quality from Greg Bender, but I thought I’d see if I can bring the Guzzi into 2020.A few words on the M-Unit.
This is truly a little box of magic. It has the potential to remove all fuses and relays from your bike, along with a much more sensible concept of running power (i.e. not running all your headlight current through your switchgear, or have multiple connection points etc for your starting system – startus interruptus anyone?) – and if combined with a RR45 Reg/Rec removes a good chunk of electrical gadgetry from the bike.
The m-unit works on a concept of “inputs” and “outputs”, where an aspect your wiring system is triggered by the input going to ground, thus triggering the output power. i.e. A Push your horn/starter/indicator button will “ground” the input of the relevant circuit on the m-Unit (left hand side of my diagram), and when grounded the output will switch on and provide power direct to the horn/starter/indicator via a monitored and protected circuit (thereby removing the fuse for your circuit and the relay (horn, starter ect)).
The m-unit also has a suite of “enhancements” such as an Alarm (with adjustable sensitivity), Single Wire Brake Light, keyless start and a myriad of settings such as auto blinker off, initial pulsing brake light, speed/distance sensor for tracking service intervals – some people love this stuff, some hate it as it “complicates” a simple and rugged motorcycle in there eyes – either way its just settings and the wiring is much simpler
I opted for the “M-Unit Blue” which has Bluetooth enabled, this allows much easier set-up and changing of settings, and activates a few extra features from the basic (keyless start I think)
If you are contemplating a full re-wire of your bike I would highly recommend the m-Unit – (at the moment anyway, check back in later or feel free to ask me for a longer term review on the usability, faults/foibles etc)
Below is my wiring diagram, I have just commenced the install, and will attempt to provide some updates along the way – feel free to critique
Happy to answer any questions or test any functions for anyone that was thinking of purchasing
I'm using a RR45 Reg/Rec and new switchgear (K&S 12-0041) - and have opted to fuse the power to the M-unit (primarily incase of a reg/rec meltdown - the m-unit doesn't really need it apparently as should be able to handle just about any fault but nice to be on the safe side) - build will likely be a bit slow.
Edit - Wiring Diagram image wasn't displaying for some reason - have re-linked the image