On a Kohler 20kW, a factory-installed bonding jumper connects neutral to ground. If your transfer switch is (most RXT models are), this jumper must be removed . The diagram includes a note: “Remove bonding Jumper JMP1 when used with non-separately derived system.”
He signaled the homeowner. They flipped the main breaker. The house went dark for exactly ten seconds. Then, with a low, confident hum that sounded more like a distant air conditioner than a heavy machine, the Kohler roared to life. In the kitchen, the lights flickered and then stayed bright. The refrigerator hummed, and the Wi-Fi router blinked back to life. 14RESA 14RESAL 20RESC 20RESCL 20RESA(L) Installation Kohler 20kw Generator Wiring Diagram