Bnineteenteam 36V/48V 250W Electric Bicycle Wheel Kit

[Mappier]

Hi all,
The lockdown got me out on my 17 years old Specialized Expedition bike which I hadn't ridden for some years and it highlighted the shortcomings of my 74 years old knees. fancying a project I ordered a Bnineteenteam 36V/48V 250W front wheel kit from Amazon. It arrived last Thursday.
I'm new to ebikes but the kit fitted to the bike without too much trouble even without any instructions. I hooked up a new 36V battery and the display lit up, good. Alas when I spun the crank hoping for the motor to come to life, nothing. I tried the thumb throttle, still nothing. I disconnected the brakes in case the switches were sticking, still nothing.
I'm fairly mechanically minded but have no electrical background, where do I go from here? Is there a simple troubleshooting guide I could follow without specialist electrical test equipment?
Thank you in advance.
Jim

 

[vfr400]

Can we see a few photos of what you have so that we can give appropriate advice. In the meantime, make sure that the motor connector is all the way to the marked line, not just in tight.

 

[Mappier]

Thanks. Although there wasn't a connection diagram of the leads from the controller every connector is different so impossible to make a mistake. Having said that some wire colours didn't match up. The only mod I carried out was to cut off the bullet connectors on the red and black wires to the battery. The battery came with a C13 plug and I spliced extensions to the controller's red and black wires.
The hub motor is labelled 48v 250w, would it improve performance in the future to use a 48v battery?
Hope this helps.
Jim

 

[Nealh]

The controller a KT is dual voltage so yes in the future one can simply use a 48v battery.
Does the throttle not work ?
Does the throttle & PAS use the same SM3 pin Male or female pin connector from the controller or are they opposing male and female connector ?

 

[vfr400]

If the wires didn't match, that could be the problem. Can you show us.

BTW, your motor is in upside down. The cable should go downwards unless you want to use your motor as a fish tank, while you're riding. Also, your 48v motor might be a bit slow at 36v unless it's a high speed one.

Keep the throttle away from the bend on the handlebar or else it'll jam. You should be able to get the brake right against the shifter, then slide the throttle until it's against the brake. Did you use the little ring with three tags in it, which is a spacer to stop it jamming on the brake?Most people don't realise what it's for, so they leave it off.

 

[Mappier]

Thanks Nealh and vfr400, I'll make those adjustments.
The lead from the throttle has pins and from the PAS sockets. The PAS lead is on the left with the heatshrink.
Do you suggest I return the 36v battery and buy a 48v one?

 

[vfr400]

Pull back the heatshrink and check that the wires are connected in the right sequence.

Disconnect everything from the controller except the battery and LCD. Switch on the LCD and check that you have 5v between the red and black on the throttle, then connect the motor, PAS and throttle and recheck the 5v after each one.

 

[Mappier]

I peeled back the heatshrink and the wires are connected in the same sequence. Did a voltage check on the throttle and PAS and they are 4.52v. Connected the motor cable and rechecked voltages which were still 4.52v. I turned the crank forwards and backwards, no motor movement.

 

[Nealh]

Double check the hub motor connector is fully pushed home.
Have you checked battery voltage with the meter ?

The PAS sensor needs to be about 1mm from the magnets on the disc and the sensor might have a Red led that blinks when it senses a magnet/pulse , the throttle may simply not work because it may be pre - programmed as pedal first for it to operate. The walk assist should work with out PAS operation.

 

[Mappier]

DaDa success! I pushed the motor connectors together really hard and felt a little extra engagement which did the trick. I'll do the mods suggested and try it on the road to see how the 36V battery performs; I may send it back in exchange for a 48v one.
Thanks for your assistance.
Jim

 

[Nealh]

Often it is the fix quite a few fail to realise often disbelieving what they are told, if one looks carefully at the connectors not only is there an embossed arrow for alignment there is also an embossed stop line on the motor end of the connector. It only needs 1 -2 mm for engagement to be ineffective.