John deere 318 wiring diagram I replaced an bg 316 onan with an bg 318 onan new the starter only has one bolt for wires the old one has a bolt and a plug on where does the purple wire go on this new engine.

Purple wire goes to the solenoid on starter.If you installed starter with single wire post all you have to do is mount a solenoid to the frame just in front of starter,existing batt/starter cable goes to one solenoid post,purchase a short red cable and install on other solenoid post and run it to the starter,plug purple wire into new solenoid and the way you go.

I believe the starter on your new engine requires a remote mounted starter solenoid. Or you may be able to use your old starter on your new engine.