The first sign of something amiss was an odd bulge on the 9 pin connector that wasn't there before! Pulled it apart and found yellow power pin blackened.The one in line with the bulge! On to the connector box behind the controller and minor mayhem.A melted connection! I had trouble last June with the kit bullet connectors..they got too hot at one point. So snipped off the bullet part and used screw terminals. OK, only 10 amp jobs, but the ones connecting the battery had never given trouble. However, I did not snip off enough so a bit of bare metal protuded from the screw connection. Normally that would be no problem, but an unconnected wire from the controller, not needed, may have rubbed enough to contact the yellow power lead which may have caused a momentary overload. Or perhaps it was caught up by chance in the melting moment! I will never know.Weirdly though, the bike still went fine!! Cleaned up the black pin and tested all the wires for continuity and shorts. All OK.Used Dielectric Silicone Grease on reassembly as the scraped pin has lost it's gold coating Replaced melted screw terminal...no bare metal showing now! Everything works fine...for the present. I must consider Anderson power poles now, even if I must buy an expensive crimper as I,m not too good at crimping. Why do Ebike kits come with soft plastic covered bullet connectors when they appear to get too hot?