I’ve bought a swifty e-bike as a cheap introduction when my legs got too old for the hills of mid Devon. All fine for three years when the controller failed, all mode lights flashing. With no help from swifty I started looking myself and found a big spark when connecting the battery and my controller fails after about 30 seconds, if I then disconnect and then reconnect the battery immediately then no spark and everything works. I understand discharged capacitors causing the spark but why does it cause the controller to fail? Any ideas or experience of this?
Help! Swifty ebike
- Thread starter PeteN
- Start date
The only thing i can think of is that the inrush current is causing the battery management system (BMS) to shut off power due to going over the allowed current. there's a manual for the control panel here, guessing the one you have because you didn't tell us:
T319-R LED Display
T319-R User Manual for eBike LED Display with Error Code definition.
topeparts.com
Comms error can have many reasons: motor connector not in properly; short on the 5v; water where it shouldn't oughta; connector issues; etc.
First thing, check the connector to the motor. Sometimes they can dislodged. It needs to be in all the way to the line that's marked on the casing of the plug. Hard to see, you'll need a bright light.
Check all connecters, look for any dislodgement or damage.
Check along the cables. Cable ties that are too tight can, over time, bite into cables causing the fine internal wires to fracture.
Check display unit for damage and possible water ingress.
Check all connecters, look for any dislodgement or damage.
Check along the cables. Cable ties that are too tight can, over time, bite into cables causing the fine internal wires to fracture.
Check display unit for damage and possible water ingress.
Spark arrest connectors and circuits are a thing from the rc-lipo world 
I also have a battery that sparks on connection with no capacity to fit a simple isolation switch (i gave it a fairly good try..)
These spark arrest circuits are on my 'to look up list' sorry i cant offer a full solution just yet..
I also have a battery that sparks on connection with no capacity to fit a simple isolation switch (i gave it a fairly good try..)
These spark arrest circuits are on my 'to look up list' sorry i cant offer a full solution just yet..