I am in a state of confusion. I have looked and cannot find a Co. that sells a book on the wire diagrams for riders. I am not blessed with working on one brand. I get any thing from antique's to the latest. and the wiring is a pain . I keep hoping that someone will come up with a generic type book on the wiring of at least some of the major brands. Then again I perhaps am not looking in the right place for them... This old brain does not function at its best some time. I always get them back on the lawn again but the hassle of the process of elimination is a real pain.... be nice to put a tester in a spot and get to the problem. thanks for any and all advice. paul.