motor wont start, where shud I start?

You can access the column connector under the column, pull the little trim off. You can backprobe the connector with a light or meter and see where you are at.

Colors are all pretty standard

Big red -- battery coming to switch

Big black -- switched ACC power to fuse buss

Dark blue --ignition run, or IGN 1

Brown resistor bypass, or IGN 2

yellow start which fires start relay