I picked up a walkbehind minus the engine. I was going to put my 12 hp B&S electric start on it. I've been looking at the wiring diagrams and I ge more confused every time I look at it. Anybody have any experience at this or maybe some good advice? I may just buy a Kaw or Kohler to go on it if I can't figure this out. I know I'll need a battery box, solenoid, starter switch.