Motor Replacement Question - Ridstar Q20

[Namikis]

I have The original motor of a bike out - see picture.



The harness is damaged, so I found a possible replacement on eBay and bought it. The plugs are not identical, see existing motor pinout:



The new motor has an extra wire using a slightly different pin configuration, but the rest of the motor looks almost identical net of the board:





Can I replace the plug of the new motor with the one from the old one, mapping the wires by color? Alternatively, are there schematics available anywhere so I can figure out what each wire is doing based on the plug layout? Thanks in advance!

Nam

 

[Namikis]

The bike is a Ridstar Q20, if that helps.

 

[HumanPerson]

Welcome to the forums

 

[Annieolnie]

I'm sorry, you can't really believe in any color coding with Chinese ebike motors. Could you tell me what exact motor you bought. I've never seen that plug before and it has a pin for an extra function (it might be for temperature). The 3 large pins are your phase wires and you can test them from the motors board for continuity. Do these motors have the same wattage? Your Ridstar has a 1500w motor? I've been trying to find your original plug to look for a pinout but so far no luck. The red color worries me as that is usually for higher wattage and I haven't yet found it. You should be able to move your old plug, but getting the hall sensor wires right could be tricky. Have you watched some videos on installing a new motor cable? That would show you some of people's techniques, meanwhile I'll look around a bit more for the pinout.

 

[Annieolnie]

So, there is a video on YouTube from "Ridstar Gunna" for changing out a ridstar motor. I personally would not let this kid change a pair of socks, never mind a motor, but the interesting thing is that his old motor had a stock 9 pin connector and the new one they sent had the red plug 9 pin, that you show, so theoretically they should be interchangeable. I will put the diagram for that pinout here. You should test this all out with a multimeter. You can put a pin in your controller plug and test for ground and 5 volt ref. etc. Remember the female plug will be a mirror image of the male, you need to stay oriented to the plugs arrow and don't desolder or cut anything until you have both boards figured out. I can't find that other plug anywhere. Who makes that motor? Let us know how it is going and good luck.

 

[Namikis]

So, there is a video on YouTube from "Ridstar Gunna" for changing out a ridstar motor. I personally would not let this kid change a pair of socks, never mind a motor, but the interesting thing is that his old motor had a stock 9 pin connector and the new one they sent had the red plug 9 pin, that you show, so theoretically they should be interchangeable. I will put the diagram for that pinout here. You should test this all out with a multimeter. You can put a pin in your controller plug and test for ground and 5 volt ref. etc. Remember the female plug will be a mirror image of the male, you need to stay oriented to the plugs arrow and don't desolder or cut anything until you have both boards figured out. I can't find that other plug anywhere. Who makes that motor? Let us know how it is going and good luck.View attachment 20335

This is very helpful - thanks for digging it up. Will watch the video as well and report back when I am done.

 

[Namikis]

A quick update on this project: the 10 pin plug was really a 9 pin in disguise - the 10th pin was not connected to any wires. I will test the new motor later this week and rport back. I matched the wire colors exactly.

 

[Annieolnie]

Did you test for continuity? In China, color coding isn't even a concept. You might as well have color blind puppies choosing your wiring.