I have a Husqvarna Rider 155 and it will not start, nor turn the starter over when I use the key switch. It happened periodically in the past but now won't start with the key switch at all. However I can get it started and keep it running when I jump the two leads on the device that is next to the battery. When I do this I turn the key to the run position. Can someone provide me with a wiring diagram of this unit? I have the owners manual for the mower & engine but feel I need a wiring diagram.