"ricelake922"....I see you understand the 12volt "salesman switch" at the door can shut you down, but are you aware it's connected to a solenoid in your run bay (the bay under the driver's window). If that solenoid fails, you'll lose your 12 volt power to the items you described. The solenoid is has two large battery cables connected to it. When you turn on the switch at the door, it causes the solenoid to internally connect those two large cables together.
You can test the solenoid by jumping those two cables together. If it is the solenoid, simply disconnect the two cables, bolt them together and wrap them in black electrical tape.