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determine wires + or -

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bacongrease:
 So MG loves to have all negative wire to battery, unlike other bikes grounded to frame.  Battery is out.  I have 8 wires and I do not know the best way to determine if a wire goes to the pos battery post or the neg.  PO had various add ones, garmin, voltage reg...etc. so I dont know which are + or not.   :shocked: . 

EDIT:  I determined the major + and ground..its all the other little wires ? ? Afraid to fry the ECU..

thank you                    :boozing:

Dr. Enzo Toma:
Not sure which model this is for, but for 8 wires I'd not run 4 to each battery terminal. Personally that's too much chaos for me. I'd add a power distribution module or a small fuse box. A bus bar if you want to go super simple.
What colors are used on the wires, if not red and black?

moto:

--- Quote from: bacongrease on August 11, 2026, 08:30:51 PM --- So MG loves to have all negative wire to battery, unlike other bikes grounded to frame.  Battery is out.  I have 8 wires and I do not know the best way to determine if a wire goes to the pos battery post or the neg.  PO had various add ones, garmin, voltage reg...etc. so I dont know which are + or not.   :shocked: . 

EDIT:  I determined the major + and ground..its all the other little wires ? ? Afraid to fry the ECU..

thank you                    :boozing:

--- End quote ---

I might ttry each of them with a disconnected 12v battery after looking on their respective websites for information. If you're wrong, you won't hurt the ECU. Once you get it figured out I recommend the Fuzeblock FZ-1 or something similar to tame them all.

aklawok:
USB outlet, grip heaters,sae powerlet, all going to the battery. Had the same problem on my CalVin a while back. Had to get longer battery bolts. Guzzi colored the main +/- wires but not the others, they are a little short where they come up to the battery too. Had a fit chasing my own tail when Missed connecting one of the grounds, it slipped behind the battery and caused a no start. I pull my battery for winter storage and have since put a zip tie on each set when I do, just to not mix them up again. A little black tape to flag the grounds works too.

Dr. Enzo Toma:
I had a Fuzeblock FZ-1 on my V7 850 for a few years until it failed. I think it was water damaged, despite me having taped it up quite a bit when installed under the side panel on the bike. They're about $100, and I didn't need so many connections, so I replaced it with a Tusk accessory power harness good for 3 accessories at $45. It's worked just fine for powering 3 accessories. I have it powering my Garmin GPS and Koso heated grips with ignition on, and my GPS tracker all the time. For a switched-power trigger source, I have a posi-tap on the OEM accessory USB port installed under the seat of the bike.

Here is a photo of the Fuzeblock FZ-1 and Tusk accessory power harness side-by-side.





Here is a photo of the Tusk unit stuck to the battery holder on my V7 850.

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