Wiring issues

Herby

Finding my (electric) wheels
Feb 1, 2025
12
1
So presumably these 2 wires are connected in the julet socket and are supposed to be connected ?
 

saneagle

Esteemed Pedelecer
Oct 10, 2010
7,369
3,402
Telford
So presumably these 2 wires are connected in the julet socket and are supposed to be connected ?
One more time. The red wire is connected to the positive battery wire. It carries power up to the LCD for the LCD. When you switch on the LCD, a MOSFETis activated. It joins the red wire to the blue wire, so the power goes back down the blue wire for the controller. The LCD therefore switches on the controller as well as itself.

The MOSFET works like a relay or electronic switch with red one side and blue the other. When the switch is off, a very small amount of electric charge can leak through, like a water tap that doesn't seal properly.
 

Herby

Finding my (electric) wheels
Feb 1, 2025
12
1
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.
 

saneagle

Esteemed Pedelecer
Oct 10, 2010
7,369
3,402
Telford
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.
Can you please explain which measurement you did that brought you to the conclusion that they're connected?

Even if they were connected by a dead short, it would make no difference to the function of the bike, since they must be 100% connected during operation. The only effect would be that your battery would run down very slowly when switched off.

A short between the red or blue and any of the other wires would be serious or fatal for the electrical system, but not between red and blue.

As I said before, you can test the bike without the cable and without the LCD by shorting the red and blue wires on the controller. That would eliminate any problem in the LCD or cable.
 
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Herby

Finding my (electric) wheels
Feb 1, 2025
12
1
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.
 

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