I want to connect a new rear light to my eBike

[eHerki]

I've already tried connecting it, and in the process, I caused a short circuit that burned out the motor controller. I've ordered a replacement, which will arrive in a few weeks.

If anyone here could tell me how to get the brake light working, I would be very grateful.

I've been able to connect the turn signals and caution lights, but I still don't know how to get the brake light working (Red light gets brighter when you press the brake). The controller has two wires, and the light I want to connect only has one.



Old Motor Controller Model: X062-AB002B



New Controller Model: X062-AB003

 

[n00b]

You don't just want a rear light. You want a brake light, and probably that controller you ordered does not have that.

 

[n00b]

Oh! That has that battery that blew up on the Hong Kong dude.

 

[eHerki]

You don't just want a rear light. You want a brake light, and probably that controller you ordered does not have that.

This is the new controller

 

[Apartunis]

The built in lights of controllers are set up for typical bike generator lights, typically 6V nominal with 2.4W front and 0.6W rear. Be aware of the possibility that the light output could be full battery voltage, but even in that case it will be power limited. Use a light that consumes much more than intended and you will burn the circuit.

You can use the output to switch on an automotive relay or mosfet or a solid state relay that has no restrictive power limit.

 

[eHerki]

The built in lights of controllers are set up for typical bike generator lights, typically 6V nominal with 2.4W front and 0.6W rear. Be aware of the possibility that the light output could be full battery voltage, but even in that case it will be power limited. Use a light that consumes much more than intended and you will burn the circuit.

You can use the output to switch on an automotive relay or mosfet or a solid state relay that has no restrictive power limit.

This is the light, it supports Voltage: 12-48 (V)
The battery is 48v

 

[Apartunis]

This is the light, it supports Voltage: 12-48 (V)
The battery is 48v

There is the issue of nominal versus actual voltage. I once got a digital voltmeter rated 9-36V or similar and I assumed I could use it for a 36 volt system. It did not function over 36 point zero volts. So in lithium battery terms a 48 volt limit would be 11S. If you can determine that 60V is the actual limit then 48V packs would be usable.

 

[eHerki]

My problem isn't the voltage, it's the wiring. The original controller burned out because I connected the wires to the wrong place (apparently).

I have a module that lets me lower the voltage to 12V for the lights. I also have two more lights that I'll install on the front for turn signals, and those run on 12V.

 

[Alex12345]

If you have a multimeter, I would try checking what's happening on those blue and white wires when you depress the brake. This would probably be more safe than trying to guess. I have a similar but older brake tail blinker light, and it expects 48v on the brake line in order for that to light up, basically just a separate 48v rated light. Perhaps heybike controllers have a different system of brake light control, perhaps via PWM (I had it on one other bike). Perhaps these are signal and ground and not high voltage lines, or maybe 12v or something.

I found a light marketed for heybike with seemingly compatible connectors to your controller, perhaps these are the type the controller expects: Taillight for HeyBike Electric Bicycles

Regardless, I think you should be able to make your lights work if you can understand what's coming to that blue white connector on the controller side..

 

[eHerki]

Thanks, I've already ordered a multimeter to test the connections.

I already have that rear light on my Heybike and it works perfectly with the controller, but I want to replace it with the new one that has turn signals.

 

[Apartunis]

You have turn signals on the ends of your arms. Using blinkers that are only two inches from the centerline of your bike is much less visible and understandable than using bicycle hand signals.