Review on EFuncar Rocker Switch 12V 24V ON/Off by Chris Drury

They work like switches and seem pretty reliable. I saw a post mentioning LED issues so I bought 6 packs for two switches. I was really hoping that all 6 would actually work, but none of them did. The LED will blink when the switch is flipped, but that's about it. I connected as recommended. 12V source at top left, 12V circuit to load at bottom left, and battery ground at bottom right for "lights when on and off when off". The download works, the LED only flashes once.