Over the last few months, I have seen several posts stating in one way or another, "I have little or no knowledge about electricity, but please help me troubleshoot this electrical problem".
What follows is my advice about what to do if you can make the above statement or anything similar. I hope everyone will accept it as it is intended. That is; to save someone from injury, accident, or worse.
Don't try to find/repair electrical problems if you are not familiar with electricity and how it is used in power wiring circuits. 115 volts easily has the potential to kill a person. Under certain circumstances, 12 volts can certainly at least cause pain, and due to the high current often used in 12 volt
circuits, it can easily start fires. I know it is tempting to get at a problem and save a few bucks, but the price could end up being very high. If you can not find a friend locally who has the necessary understanding of electrical circuits, then hire a professional. Answers and advice given remotely via the forum or other means, generally tells you what is suggested that you do, but not how to avoid injury or accident while doing it. This danger is exacerbated in an Airstream, because nearly every structure around you is grounded metallic conductor.
I will now remove my grandmotherly bonnet.
I do not now or have ever made money repairing electrical things, so that is not my motive.
PS: this equally applies to propane systems.