This is the on/off switch which is used in the following Powakaddy electric golf trolleys:
Powakaddy FW3 / FW3i / FW3s
Powakaddy FW5 / FW5i / FW5s
Powakaddy FW7 / FW7s / FW7s EBS / FW7s GPS
Powakaddy C2 / C2i
 
Please be aware that all brand new trolleys come with a 2 year warranty and if your cart has started to develop faults please take it to your nearest warranty centre. 
please visit the Powakaddy website for your nearest Centre.