cross-posted from: https://lemmy.perthchat.org/post/321128
I have tried: taping them together, hot glueing them together and ziptying it right to the frame to prevent jiggle.
All have failed.
Right now, when I reconnect them and apply pressure, I can't even get the engine to turn on anymore. But the speedometer still works and that signal is sent through the engine cable too.
Recently, sometimes the engine rear wheel barely rolls when I roll the bike backwards.
There are no ebike repair stores in my city.
I think at this point you might need a new cable, since the connection socket most likely loose on the inside. Once you got a new one, try ziptying the ends below the connection joint (to ease the stress on the joint), ziptie it to the frame (as you did last time) and bonding the connection itself with epoxy resin (could be found in hardware stores).
While using adhesives (epoxy), make sure you cleaned the surfaces very well
Inside the cable there are 8 or so smaller wires and when I looked up the cable I couldn't find the same one anywhere
Can you post a photo of your actual connector? Inspect it closely for broken/damaged pins. Where do the other ends of these cables go? If it's a proprietary connector that's hard-wired into the motor, then replacement cables might not be readily available. If the connector is broken and replacements are not available, then I would probably consider replacing the connectors with a soldered connection.