Herby

Just for the update. I sourced a similar cable but without the brakes wire. 5 pin flat at the controller end and 5 pin julet to the lcd. Before installing I did the same connectivity test and lo and behold, the red and blue are not connected at all! Installed the cable and the first thing I noticed was that the lcd power switch now works to turn the bike and the screen on and off. Test ride and everything works perfectly. The absence of the brake sensor doesn't seem to affect the operation at all as the motor cuts out when you cease pedaling anyway. So thanks everyone for your inputs.

Ok. So initially I thought the cable may have a wire that was broken because at the hinge in the frame the cable had been squashed. So I removed the cable completely from the bike, no battery and no screen or controller connected and using the multimeter I attached one probe to each of the 5 pin hole terminals in the julet connector and the other probe again in turn to each of the 5 wires in the flat connector. I was simply testing for continuity. This is where I then found that red and blue wires are are connected, somewhere inside the cable.

I do understand about the red wire carrying a voltage to the lcd screen and making a connection with the blue when switched on. My issue at the moment is that the whole cable is removed from the bike and is sitting on me desk with no battery and no lcd screen attached yet the red and blue are showing they are connected ( no resistance ). This is why I thought the cable may be at fault. By the way battery terminal are just blades and look to be in good order. Cheers for your input.

So presumably these 2 wires are connected in the julet socket and are supposed to be connected ?

Thanks again for taking the time to reply: very much appreciated. The cable is removed from the bike and so not connected to anything and no voltage going through. I have attached 2 pics of the multimeter reading as I connect to the terminals. I’m sure they shouldn’t be showing this reading. I don’t think it’s a false reading.

Legend. Thank you. If it’s the battery then the bike will be junk, too costly to replace a battery. I still don’t really understand why/how red and blue would be connected when the harness is not connected to anything. When reassembled If red is active and carries voltage it would already connect to blue before any buttons are pushed. Maybe thats why I hear a spark when I reconnect the battery (re-join the folding hinge).

The whole story ? bought it from police auction (stolen/recovered). No key or charger. Only requires key to remove battery. Bought a 48v charger. Bike worked fine for about a year. I’d say it’s about 10 years old. Then it would not turn on via the lcd screen buttons. Thought it might have been a battery issue so unclipped the frame hinge to access the battery, still fully charged ( it’s a folding bike). Re clipped the hinge and the screen came to life. Bike worked fine again but still would not turn on via lcd. LCD works to turn it off though. After each ride would unclip the hinge to disconnect the battery. After a few weeks like this the lcd battery indicator seems arted to show rapid drain of battery while riding and then no power to motor. Pedalled home manually and checked. Battery. Still fully charged. Bought a replacement lcd and made n difference. Sourced a replacement controller through Ali baba. No improvement. Checked this cable and found that red and blue wires are connected with no resistance. I assume that this shouldn’t b happening. Why would 2 wires thst are encased need to be connected ? That’s the whole story.

Thanks again. The brake wire is hidden behind my finger. It’s is a flat 5pin at one end with a 2 pin for the brakes (but just a single wire). The flat 5 pin and 2 pin connect to the controller. At the other end the green julet connects to the lcd and the 2 Red junkets connect to the brakes. Unknown if previous owners modified. Hopefully this photo explains the connectors.

thanks. There are no error codes. I have disconnected the main cable so there is no power running through. Also disconnected from the brakes. The red and blue wire are connected ( continuity tested). The problem. Unable to to turn on the bike from the lcd screen on button. Bike turns on if I disconnect and reconnect the lcd 5 pin plug or if I disconnect and reconnect the battery. Battery is fully charged and after a few minutes riding the battery level indicator goes down rapidly and then no power to motor. Voltmeter shows battery is still on 54v and hasn’t gone down. The bike will turn off from the lcd screen button. New lcd screen and new controller installed.

It’s a bafang 250w motor and screen is bigstone c300s. No throttle or lights.

Thanks Neal. Bike is something called. neocycle bmx stealth. 20inch fat tyre, folding bike. Said cable appears to have been squeezed when the bike has been folded/unfolded. I have examined the squeeze wires and removed the sheath around the squeezed area and while testing the continuity have jiggled the wires.. No real sharp bends.

Thanks Matthew I’m thinking the short must be inside the sealed connector as the cable seems to be unbroken.

Hi all. I’m encountering issues with lcd control panel messages and think there is a short somewhere in the wiring. I have replaced lcd and controller. Battery is good. The problem I think is the harness from the lcd (5 pin connector ) that joins the brakes (2 pin connectors) and then travels through the frame where it end in a flat 5 pin connector that plugs into the controller unit.at the flat pin end there seems to be no resistance between the red and blue wires. Obviously the same lack of resistance at the green 5 pin plug end. Ohm meter tested and there is continuity. I would have thought each wire would be independent and not connected in any way to any other wire. Any suggestions on where to obtain a replacement cable would be appreciated. Thanks