Unfortunately, neither the
eBike D.I.Y User Manual nor the
Prokit 901/902 technical Manual has been updated in the last 11 years, but during this time many changes have been made to both the controllers and the wiring.
![Roll Eyes ::)](https://goldenmotor.com/SMF/Smileys/default/rolleyes.gif)
To my knowledge, the Anti-Theft alarm function has not been available on the external controller for at least 9 years and I'm pretty sure that the "soft-switch"
(or "Lock" switch shown in the following diagram) was only used for controllers that supported the Anti-Theft function:
![](https://i.imgur.com/K75Zm91.png)
Early controllers had an external wire looped between the "B+" connector and the "G" terminal that could be cut to to allow the switch to be inserted if required:
![](https://i.imgur.com/uibtq3r.png)
But some controllers appear to have the battery feed directly connected to the "G" terminal inside the controller:
I've had the same problem with one of my magic controllers (36v V2)..
The 'G' wire had no effect on "turning off" the controller.
I suspect, by mistake (or on purpose), they soldered the 'g' wire connection to the main power line INSIDE the controller.
I wanted to use it for setting the alarm function, but alas, couldn't.
I'm not quite sure what you mean by
"There is a jumper between the 5v terminal s and I suspect I can simply cut the switch in series with these terminals" so it's difficult to comment on this.
![](https://i.imgur.com/djgiZew.gif)
Which terminals on the above controller are you referring to?
Alan