If one side is grounded when it switches and isn't when not then could you add a relay or some sort and tie the grounded in the A2 side of the coil and the 12v on the A1? Kind of like npn, the coil will not engage until it sees a ground, or 0v.
Just thinking in the fly, I've never heard good on those generators so I stay away.
Just thinking in the fly, I've never heard good on those generators so I stay away.