Neal, I know you only want to help him, but i already gave him an instruction that will get him quickly to the root of his problem. More information and more things to try are only going to confuse things. One step at a time, eh?
Sinan, you need a digital multi-meter. You can get one from any DIY shop or from Ebay, Amazon Etc. You shouldn't really think about messing with ebikes if you don't have one. Like this.
https://www.ebay.co.uk/itm/Excel-Green-Yellow-Multimeter-Voltmeter-Ammeter-Meter-Tester-AC-DC-OHM-Volt/283378743329?var=584345156087&hash=item41fab07821:g:7bsAAOSwxS9cZSlU
Sinan, you need a digital multi-meter. You can get one from any DIY shop or from Ebay, Amazon Etc. You shouldn't really think about messing with ebikes if you don't have one. Like this.
https://www.ebay.co.uk/itm/Excel-Green-Yellow-Multimeter-Voltmeter-Ammeter-Meter-Tester-AC-DC-OHM-Volt/283378743329?var=584345156087&hash=item41fab07821:g:7bsAAOSwxS9cZSlU