There is an electrical switch of some type attached to the starter itself, and it doesn't look like a bendix. According to the service manual, there is a starter relay in the aux relay box, which is directly below the power distribution box under the hood. I've attached schematics from the 2006 service manual for your enjoyment.
2006 Damon Daybreak 3276 35'with 5 Star Tuner. 3 200 Amp Lithium batteries and 2000 watt PSW inverter/charger. 2013 Elantra on a Master Tow dolly.