Are you certain these switches are normally closed ? The picture of the light circuit indicates they are normally open, without magnet.

You are correct. Almost all of the reed switches on Amazon universally have the NO/NC descriptions backwards. Even the guy who responded to you about his RV steps was mistaken as his application would require a normally closed switch (ie. door opening and removing the magnet would allow the current to flow). I think the big misunderstanding is these vendors (and some people) think the "normal" position is with a magnet adjacent the reed switch. It is not.

Color Name	ブラック-NC
Batteries Included	No
Batteries Required	No
Brand	Gebildet
Manufacturer	Gebildet
Item Model Number	E332
Material	ABS
Mounting Type	ドアマウント
Package Dimensions	17.4 x 11.4 x 3.5 cm; 70 g
Item Weight	0.07 Kilograms

Gebildet 埋め込み型有線セキュリティウィンドウゲートコンタクトセンサーアラーム磁気リードスイッチブラック、磁気ドアセンサー、ノーマルクローズ磁気スイッチ 5個

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