Even seasoned pro's get burned by the "salesmans switch"...
With fur babies on board in extreme heat I just did not want to risk them bumping the switch nor me on the way out.
Many of us have bypassed it do to this and the fact that the solenoid that is involved can drive you crazy.
You being a novice could use some resources to help bring you up to speed on these very complex systems. Dividing the electrical systems into DC and AC is always confusing at first but after awhile it becomes second nature.
Check this out and at the end there is a link to a second part.
The 12volt Side of Life (Part 1)