How to diagnose a faulty ebike

Ebikes can be complicated machines to fix when they go wrong. Letr me give you some tips and trick mon how to sort it out.
https://www.ebay.co.uk/sch/i.html?item=304776944345&rt=nc&_trksid=p2047675.m3561.l2562&_ssn=cycle-fast
www.cycle-fast.co.uk