First, I wired in the magneto control (ground) wires. These are a pair of 18 ga shielded wires that run to the magnetos on the engine. These wires run through switches to ground. When grounded, the magnetos don't provide spark to the engine and the engine doesn't run. The wire shield of both wires has to be grounded. The magneto wires connected to the appropriate locations on the main buss.