Last one we did, we did wireless. Installed a series stop switch ahead of the factory stop switch. low voltage xfmr and NC timed relay worked fine. placed the receiver under the housing of the geny for weather protection and the xmitter runs on 9v battery. They push button, NC opens and geny stops. The timed relay stays latched (open in our case) for whatever time we set it for then releases. We set it for 30 seconds to give the xfer switch time to sense the loss of emer power and presence of POCO power and do it's thing. One big thing we had was a xfer setup that, once it lost power to the run loop, would not restart without a start pulse; otherwise it would restart or just sit there with the ignition switch open forever. Wasn't difficult to do and the best part is that nobody can figure out what we did so we now do the annual service which consists of changing batteries and testing xmitters. Kinda like job security. Yeah I know ... that's tacky.
