Just install 2 switch harnesses next to each other for power on the exterior of the plane. Then 1 switch harness upfront for ignition. 3 total on outside of airframe. Make sure all swich harnesses have charging jacks. Other then that ... it's no brainer installation. Just run the battery backer inline with 2 batteries and 2 switches. The single wire on the box goes into RX. Here is how I have mine mounted on my 33% Laser. The RX is safely inside the box under the battery backer.