I found a mouse nest in my 1985 20hp Evinrude and they chewed on some part of a 4 wire harness that connects to a rubber plug fitting with a retainer clip on it. I taped the wires up individually and the motor runs OK. I think they were getting in the air intake so I added a 1/4 inch metal screen cap to the intake hole and retained it with a spring. Anyone have any ideas if taping these wires is OK and how to keep mice out of the engine?