Have a jinling 250cc 21b quad
 

My quad is a road legal one on a 2012 plate, been not used for about a year. It some times starts and sometimes don't, when it some times gets worm it will tick over but not rev. I do no that my mate who got it from new had a problem with it after 2 to 3 weeks were the dealer told him to take it to a quad shop and they would pay the bill. The auto elect man changed some burnt out wires by the battery and put a bigger battery on it, and it seemed it was all better. I m.o.t. it the uther day and taxed it whent out on it but after about 30 min it did not cut out but lost all power. I took the seat off and seen there is a green earth wire all melted so got it taken home and fixed the wire with a newer bigger one. I downloaded the wireing diagram but found in the wireing loom this block of 4 wires going in to a block with 3 resisters and a wire all soldered together but have no idea what it is any one help me with this pleasehttps://cimg6.ibsrv.net/gimg/atvconn...1bfd4973fd.jpg
https://cimg1.ibsrv.net/gimg/atvconn...7a329c6bb0.jpg?......