While buying some items from the listings of what was obviously a Chinese seller's UK warehouse, I came across this listing for a complete wiring loom/harness for a quad ATV (All Terrain Vehicle). It seems that these are a common item on eBay at what appears to be a ridiculously low price.
I guess that maybe if you have an issue you can fire this fully loaded parts cannon at it to resolve most issues.
I bought a loom purely to explore, and had lots of fun reverse engineering the way the components were connected and how they operate. It contains:-
The stator of a magneto with three windings. Low voltage, high voltage and sensor.
A CDI (Capacitive Discharge Ignition) system.
An ignition coil.
A spark plug.
A key switch.
A rectifier/regulator.
Battery terminals.
Starter relay.
handlebar control unit.
A cable loom with matching connectors and some spare.
No instructions whatsoever.
Here are my findings. Feel free to correct me if I got anything wrong.
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12 thoughts on “Exploring the wiring loom of a chinese quad / scooter.”
  1. Avataaar/Circle Created with python_avatars Jeffrey Stroman says:

    Basket case two speed Italian moped with pedals. Trouble shot for a few days and I finnally stopped and wired up a tail light as that was missing. Then all of a sudden it started up. They ran the coil thru both the tail light and rear brake light so if rhe bulb burnt out it couldn't be ridden until a working bulb was installed at the rear fender. Pure genius on their part, mostly luck on mine

  2. Avataaar/Circle Created with python_avatars Bernard Samson says:

    Clive The Kick Stand stops engine if down! that is other safety circuit.

  3. Avataaar/Circle Created with python_avatars Harris Appleton says:

    Think I need one!

  4. Avataaar/Circle Created with python_avatars carlu bambi says:

    Fantastic to see this .I was just getting into physio rehab 2 years ago from COVID .Amazing what I missed

  5. Avataaar/Circle Created with python_avatars C-c Coates says:

    I had a cheap gas scooter that about 1/2 wires were not attached.

  6. Avataaar/Circle Created with python_avatars Aberdeen Compassion Society says:

    Were could I purchase this harness

  7. Avataaar/Circle Created with python_avatars VdubSPAZ says:

    So the rectifier probably has diodes that are directional It turns AC into DC or vice versa….
    You can literally turn any AC into DC and back by the current flow of where you connect the diodes and into a thing called a bridge…. That's why if you want to you can look up the bridge rectifier and it's very simple for diodes and you have the ability to switch from one to the other AC or DC

  8. Avataaar/Circle Created with python_avatars Tony Soliz says:

    I just wanted to say we're you you at when I needed a video explaining everything on the harness what it does we're each individual connection goes to saves me big nothing like the other videos I give this a 10 star thank you very much

  9. Avataaar/Circle Created with python_avatars jasper pushbutton says:

    Please give us a link to this wiring loom. Thanks.
    Love you channel

  10. Avataaar/Circle Created with python_avatars jose Santana says:

    Quiero arreglar uno q tengo y nesesito los cables

  11. Avataaar/Circle Created with python_avatars jose Santana says:

    Como conseguir eso cables

  12. Avataaar/Circle Created with python_avatars jezman9 says:

    Dash plug you marked is actually the rear brake and taillight

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