Hotwiring generic controllers to power "on" possible?

[sonnetg]

Hello,

I have recently purchased an extra controller for my ebike as a backup. Unfortunately, this new 12 FET controller is not compatible with my existing 810 LED computer. I only use the LED computer as a key switch to start/stop the motor. I do not use any cruise or PAS functionality.

I was wondering if it is possible to hotwire these controllers? The LED plug has 5 wires: Red/Blue/Black/Green/Yellow.

Would it be possible to hack this controller and turn it on with an external switch? Any EE gurus here can shed some light on this?

Cheers.

I have attached an image to show the incompatibility of my 810 LED panel and the new 12 FET controller.

 

[amberwolf]

Use your volt meter to measure each of those wires when the system is off, and then when it is on.

Whichever one is different is the one you need to "hotwire" with the measured voltage.

 

[sonnetg]

Use your volt meter to measure each of those wires when the system is off, and then when it is on.

Whichever one is different is the one you need to "hotwire" with the measured voltage.

Ah got it. Seems like these are controlled by voltage and not simple on/off. A bit more complex then i thought. Oh well....the vendor was nice enough to send me a matching LED controller. I should have confirmed before I purchased though..oh well.

Thanks.

 

[sonnetg]

Just to post and update, I was successfully able to hotwire the 880 LED compatible controller. All I had to do is short the Red (V+) and the Blue (Lock/On-off) wire on the controller plug, and the controller came to life. I do have a compatible 880 LED dash, but it's good to know these hacks. Just thought i would pass this info on if anyone damaged their 880/810 LED or LCD display computer, or if the controller didn't come with the display.

Cheers.