Zero throttle voltage

I built a custom e-bike setup with a Chinese controller connected to a 250W brushless hub motor with hall sensors, 24V battery and throttle.

It did not work so I started troubleshooting. The battery seemed ok, I got 26V with a multimeter.

Next, I tested the throttle using the instructions provided here:
http://www.ebikes.ca/documents/ThrottleTesting.pdf

The problem was that the voltage between the red and black in the throttle connector was zero.
I also checked for blown mosfets, no problems there.

Any ideas, what to do next to get power for the throttle?
OR
Any suggestions on where to get a good reliable 24V 250W controller?

Thanks,
-K

pics of controller connections?

Do you also have battery(+red) connected to controllers red ignition wire? (controller won't turn on until it sees voltage on this wire...most controllers have this)

check for the 5V between the red and black on the hall sensor plug.

You haven't connected the ignition wire, like the rest of them that come on here with the same problem. Alternatively, you have a controller that's been designed to be switched on from a LED/LCD control panel that you haven't fitted, which is the same thing really.

Thanks everyone, my setup is now working!

In my controller there is a connector with thin blue and red wires which appears to be the connector for an on/off switch.
Since my battery has a built-in key-operated on/off switch, I have no need for an additional on/off switch.
I disassembled the on/off switch connector and connected the thin blue and red wires, which did the trick.

For others with similar problems with "shady" Chinese controllers, it seems that there are three main types of ignition setups (correct me if I'm wrong!):

"On/off switch" setup:
The controller has an on/off connector with thin blue and red wires, for example:
http://www.aliexpress.com/store/product/24V-250W-BLDC-motor-controller-E-bike-controller/313864_422302159.html
Connect red and blue to turn power on.

"Single ignition wire" setup:
The connector has a single ignition wire (similar to the red main positive battery wire but thinner), for example:
http://www.aliexpress.com/item/24-36V-250w-lithium-battery-brushless-motor-controller-for-electric-bicycle-or-scooter/1810697897.html
Connect the ignition wire to the red main positive battery wire to turn power on. This setup is discussed here:
http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=40024

"Always on" setup:
Neither of the above, for example:
http://www.aliexpress.com/item/24V-36V-12A-18A-e-bike-controller-for-any-bike-converion-kit/427196847.html
Just connect the battery to get power.


-K

put the controller circuit current on a switch so you can turn off the controller. then you can charge the battery while it is still connected to the controller and never have the problem of sparking when you connect the battery since it will be connected already.

since the controller circuit current is turned off at the switch it will not drain the battery down.