Looking for advice on troubleshooting BBS02

Ken Cameron

New Member
After 18 months of solid and trouble-free operation my BBS02 stopped working yesterday. Nothing happens when I try to switch it on, nothing is visible on the screen, and there is no sound from the motor. The details of my setup are here.

I have two batteries, and the problem occurs with both of them on full charge, so I am thinking it isn't the battery.

I will try to test that the battery/cradle assembly provides power using a multimeter on the cable that links it to the motor, but I don't have enough knowledge of electrical engineering to know whether failing that test could simply be a symptom of the original problem.

I will also disconnect and clean all connectors.

I have done some internet research and noted the suggestion to troubleshoot by swapping out components. At this point I can't do that because I don't have any spares, but I have for some time been thinking about getting a BBS1000, which would give me a switch/screen assembly that I could swap out. However, I am not quite ready for the BBS1000 so would rather get my current setup working again before I go there.

I am thinking that I could simply order another switch/screen assembly at a less than prohibitive cost, which would at least allow me to identify or eliminate that as the cause. But I would prefer to have more confidence that the problem is there rather than in the controller within the motor, which seems to be the other possibility.

I am a modestly competent amateur bike mechanic but no kind of electrical engineer. Can anyone suggest any tests that I could perform to narrow down the problem, or point out any faults in my thinking about it as outlined above?

Thanks in advance

Ken
 

Lost

Active Member
I'm guessing you have a power problem, my first test point would be the plug at the BBSO2 where the batteries feed. BE CAREFUL. This is how you get KFC. (Kentucky Fried Fingers).
A BBSHD is available if it truly is fried, which I doubt, for someone specifically in your shoes. https://lunacycle.com/bafang-bbshd-bare-bones-motor-and-controller-only/
That is what I would buy if my BBSO2 were completely shot.
There is a slight chance it may just be the controller, not a bad piece to change so lucky there.
https://lunacycle.com/bafang-bbs02-750w-48v-upgraded-controller-3077/
You may find this article helpful:
https://electricbike-blog.com/2015/10/02/troubleshooting-problems-on-your-bbs02-unit/

My money is on a power wire or something. A fault may have blown a fuse in both battery packs however, which would be likely a controller. Be careful with the voltages present. A friend who knows which end of a soldering iron to hold onto would be helpful.
 

Ken Cameron

New Member
Thanks, that was very helpful. The connection between the battery and the motor looks ok, and the fuses in the batteries are both ok. I will keep working and report back.
 

Thomas Jaszewski

Well-Known Member
After 18 months of solid and trouble-free operation my BBS02 stopped working yesterday. Nothing happens when I try to switch it on, nothing is visible on the screen, and there is no sound from the motor. The details of my setup are here.

I have two batteries, and the problem occurs with both of them on full charge, so I am thinking it isn't the battery.

I will try to test that the battery/cradle assembly provides power using a multimeter on the cable that links it to the motor, but I don't have enough knowledge of electrical engineering to know whether failing that test could simply be a symptom of the original problem.

I will also disconnect and clean all connectors.

I have done some internet research and noted the suggestion to troubleshoot by swapping out components. At this point I can't do that because I don't have any spares, but I have for some time been thinking about getting a BBS1000, which would give me a switch/screen assembly that I could swap out. However, I am not quite ready for the BBS1000 so would rather get my current setup working again before I go there.

I am thinking that I could simply order another switch/screen assembly at a less than prohibitive cost, which would at least allow me to identify or eliminate that as the cause. But I would prefer to have more confidence that the problem is there rather than in the controller within the motor, which seems to be the other possibility.

I am a modestly competent amateur bike mechanic but no kind of electrical engineer. Can anyone suggest any tests that I could perform to narrow down the problem, or point out any faults in my thinking about it as outlined above?

Thanks in advance

Ken
One of the best kits and deal out there is this kit from empowered cycles Ue what you need and get credit for the returns!
The BBS02 controller is a stinker, especially if you have the older version.

https://www.empoweredcycles.com/products/troubleshooting-kit-bafang-bbs02-bbshd

Displays do fail too. I've seen quite a few this season.