Direct connection without display ?

[Luis Medina]

Hi people. I saw video that for bypassing display one has to put red and blue together. I am doing that with a piece of cable from a broken display on one end , and on the other end connecting normal to the female 5 pin water proof receptor on the extension cable. Blue and red together but it doesn’t work. How come ? Thank you .

 

[Annieolnie]

Hi. There could be a whole lot of "How come". There is no standard color coding for anything on Chinese ebikes or their components. You are going to have to figure out the functions of the pinouts and know what it is you want to hook together. Color means nothing. I'll post a picture of some possibilities.

 

[Luis Medina]

Thank you. Is it ok to grab the red (supposed to be positive) and go on testing with each colour until it works, except for the black (which is supposed to be negative) ?

And, is there a way for testing each wire to identify and know which wire does what ?

 

[Annieolnie]

You definitely need to get a multimeter and watch some videos on testing a controller and basic multimeter testing. If your power wire is hot, you will short functions of your controller with your method. There is a thread on this forum where we helped a kid learn to test for continuity. It's titled , "Corroded Molex Connectors " you can search for that above and it will help walk you through some of the steps. I'll post a controller video here that might help. One more thing, are you using a KT controller for this? That seems to be what some people were referencing. There is no guarantee that your controller can be set up to run this way.

 

[Luis Medina]

Yes, I am planning to buy a multimeter and learn how to test for continuity like you said. I just need advise on which multimeter in order to buy one which is professional and capable. My controller is not KT !
One video on YouTube tells to put red and yellow together. Maybe with some controllers the red and blue together will function, and on other controllers maybe the red and yellow. Makes sense ? ( A wire diagram of the controller by the manufacturer would also help. )

 

[BiggKidd]

Yes, I am planning to buy a multimeter and learn how to test for continuity like you said. I just need advise on which multimeter in order to buy one which is professional and capable. My controller is not KT !
One video on YouTube tells to put red and yellow together. Maybe with some controllers the red and blue together will function, and on other controllers maybe the red and yellow. Makes sense ? ( A wire diagram of the controller by the manufacturer would also help. )

I've had the old red version of this meter for roughly 20 years and it done everything I've needed.

https://www.harborfreight.com/5-in-1-digital-multimeter-98674.html

 

[Annieolnie]

I've had the old red version of this meter for roughly 20 years and it done everything I've needed.

https://www.harborfreight.com/5-in-1-digital-multimeter-98674.html

He's in Brazil I don't think they run to Harbour Freight down there.

 

[Annieolnie]

Yes, I am planning to buy a multimeter and learn how to test for continuity like you said. I just need advise on which multimeter in order to buy one which is professional and capable. My controller is not KT !
One video on YouTube tells to put red and yellow together. Maybe with some controllers the red and blue together will function, and on other controllers maybe the red and yellow. Makes sense ? ( A wire diagram of the controller by the manufacturer would also help. )

I have yet to find a controller that has had any kind of wiring diagram at all. You don't need a very fancy multimeter. I prefer some of the ones that are less automated so you can see more visibly, where you are and what you are doing. Looking at Amazon Brazil I saw this ASTRO, which is a good company that is also marketed around here. Watch some YouTube videos on multimeter basics and it may also help you choose one.

 

[Luis Medina]

Thank you! I am checking out the multimeter for further testing.

The connection I was trying to make just worked by putting together red and yellow. As I mentioned, red and blue may serve for some controllers. Interesting.

Now I need to insulate the cable and install an interruptor switch on the cable.

I will use a display but I wanted to have this trick as an option in case a display fails. In my case someone borrowed me a display to try out, but it is not compatible, the bike runs but with some display incompatibility issues. A supposedly compatible display will arrive soon, but I wanted to make this direct connection as a plan B .

Thank you