Interstate Step: Magnetic Switch Fix
Hello all -- for those like me who have had a finicky magnetic switch for the electrical step, I've replaced mine and it is an easy fix. BTW, we live 5 hours from the nearest Airstream dealer so $6 and 30 minutes of my time was an easy choice vs. warranty service.
I got a replacement switch from Amazon: "Directed Electronics" Magnetic Switch with both NO (normally open) and NC (normally closed) circuits. I drilled out the rivets holding the original switch in place and pulled it loose. On our 2017 Interstate there was a 3-lead wire to the switch (white, green, and red) and plenty of wire.
I left about 3" of wire on the original switch in case the new one didn't work. Attach the wires to the new switch as follows: Wh=COM, Red=NC, Green=NO. (I may have the red and green reversed so if it doesn't work switch them; I am sure Wh is the COM). There are three exposed screws which I covered with hot glue to help secure and insulate the leads; you may have a better option but this seems to have worked well.
I affixed the new switch in place first with the (included) two sided tape and opened and closed the door a few times to be sure it worked and the position was right, then I drilled holes and secured the new switch in place with small screws and you're done. I did not replace the original magnet mounted inside the sliding door.
So far it's working perfectly! Feel free to contact me if you have questions.