Thanks for all the trouble you went showing me what to do. Sorry I didn't 'name' the colours, I genuinely thought you were joking about being colour blind.
I got the three beeps and the motor juddered to a halt.Could the problem be the thumb control and if so where would I get a replacement ??
HeadsNtails, I only wish I was joking, I have three brothers, and two of them are also red-green colourblind, but I get confused with all sorts of colours. Traffic lights especially can be a real pain when you can't tell the difference between red and amber.
Anyway, three beeps is usually a throttle fault, and if I remember correctly it only occurs when the throttle signal voltage at the controller falls below
0.6V.
It could be one of the throttle wires, a poor connection, or the throttle control itself.
I doubt it will be the Black ground wire, because when this fails, it wouldn't cause the three beeps.
If there is a break somewhere in either the Red wire
(+5V supply to throttle, cruise and pedelec) or the White
(throttle signal wire), this would cause the throttle output to drop well below
0.6V causing the three beeps and no throttle response.
I would first check to see if you have at least
4.5V between the red throttle wire, and the Black
(throttle ground wire) if this is correct then check the voltage between the White (throttle signal wire) and the Black
(throttle ground wire). If this is around
0.8V, try operating the throttle control to see if it changes
(preferably with the driven wheel raised off the ground just in case the motor starts). If the voltage does not increase, I would say the throttle control, or the White signal wire itself, is faulty. If it increases to at least
3.5V when the throttle is on full, the throttle control should be working correctly, and the fault will be between the connection being tested and the controller itself. Check the wires carefully where they enter the axle for any signs of possible damage.
If you don't have at least
4.5V between the red throttle wire, and the Black
(throttle ground wire), I would suspect either a break
(or short circuit to ground) in the red wire going into the controller. Check the wires carefully where they enter the axle for any signs of possible damage.
I should also point out that on some throttle controls, the throttle signal wire may not necessarily be White.
I look forward to hearing the results of these checks.
Alan 
