Gavb

I would just like to say thanks to all who offered their advice. My bike is back up and running and I have happily commuted to work and back with no problems. I have learnt a lot in only a few days. Many thanks again.

No it is not the brake. disconnected the brake cable so no contact with rims. Def. coming from hub motor

I just made a new shunt out of longer and slightly thinner wire and I have got slightly different readings between the 3 good combinations now. Readings were between 0.72 and 0.80mv for one combo and the other 2 were flicking up and down from 0.75 to 0.90. I have gone with lowest option. Thank you so much for all of your help. I have my bike back up and running! My only concern now is that I have done something to my hub motor as when it comes to a halt it has started squeaking for the last few slow rotations. When i push my bike forward the motor is also slightly squeaking.

Great news! Made the shunt connected up my multimeter and got some readings. 3 were initially much higher (5.0+ mv) then setttled down. These were the false positives that you mentioned I think The other 3 readings were all very similar. Full throttle initially and all went up to 1.8mv initially and all settled to flicking between 0.13/14mv. So how do I choose which one of the 3 if they are all measuring about the same?

By the way, it was mentioned somewhere that there will be 3 out of 36 possible combinations that will result in forward movement. I have 6 working combinations all spinning forwards. Other combinations span forward too but made interesting noises. 6 were all ok but some made the wheel spin much faster than others. Is that normal? Do I need to test the current of all 6?

Thank you. I will make the shunt tomorrow and let you know how I get on.

Ok great. I have a newish bosch iron that does not work so will use 100mm from one of the wires from the lead (would that be 2.5mm?) or I have an old extension lead cable. Don't really want to have to go out and buy a big reel of 2.5mm twin and earth. I will use the croc leads to connect to the probes.

brilliant. last 2 questions (I hope) 1. Where is best place to get the 14g wire and 2. What wire do i need for leads to probes? Can I use croc clip test leads and just cut crocs off one end and solder to ends of 14g. I can then clip crocs onto probes?

Ok, I am learning slowly. Thank you so much for your help and patience. Does this diagram look right?

Can I leave the + wire connected as normal and just use 100mm 14g wire with 2 spade connectors at each end to connect into my - wire, and solder in two smaller wires to the spade connectors to connect the probes to? I don't understand why I need the red thick wire too.

I don't know where the 3 smaller wires are going and how this shunt would connect into the black -ive wire.

To be honest I don't know how to make the shunt! I have looked at you picture of yours (on the paper plate) and don't understand what the wires are for. I can see 3 small ones and 2 larger ones (black and red). I am really clueless. Sorry

Just bought one of these as I thought I could just connect it and it would measure current!! I really dont know what I am doing do I http://www.amazon.co.uk/gp/product/B000JQ4O2U/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Apologies, I am still finding my way around how to use this site and I think I have started a conversation as well as replying here. I have tried to have a look at your instructions about how to measure the current and although I feel that I am quite a practical person, I am unsure how to connect it up and am a bit lost to be honest! As I was saying, I have tried 36 combinations of hall and phase wires and have found a few that work but the next step I have been told to do is to choose the one with the lowest no load current draw. I don't even know what that means! The company who sold me the controller wont help me any further. I think I have got myself in too deep with replacing my controller and am really unsure what to do next. Is there anyway that you could send me a diagram of what wires I need to connect to where etc and I will have a good go at this. I tried looking at your photos but cant work out what wires go where. I had no idea that I was going to have to get this technical. I freally want to learn though! I bought an ebike kit before so everything was just plug in and go! I think I need to put the shunt in between the battery and the controller on the black (-ive, black) wire. Is that right? battery ________+(red)_____ controller ______ motor battery________-(black)____ shunt _____ controller ______ motor So sorry to trouble you, I bet you are regretting replying to my post. Everyone is busy and if you don't have time to provide this much support then that is fine! Thanks again, Gavin.

Thank you for the information but I am really new to electrics. I have already bought a multimeter and was hoping I would be able to connect the prongs to some of the wires and get a reading. I'll have a good read of your information again later when i have more time.