Jon, that plug is where you're voltage regulator plugs into the wires coming from you're stator windings. It is not for you're ignition. On my 2000 mine started leaking also. What happened to mine was the rubber has become oil soaked and went bad to the point that the electrical connections worked apart and the system quit charging. The only fix is to replace the stator itself. If it is still charging and not pouring oil out I would check the primary oil level and finish out the summer on it. Good luck!