I just received 3 korry switches coming out a 737. Type chromalux 318. http://www.korry.com/PDF/Korry_318.pdfIn fact the 318 series are not real switches, but just LEDs.See:http://www.korry.com/switches.htmfor the product pallet of KorryI put 12 Volt on the LEDS and they lite up as they should. Here you see the drawing that is on the LED:http://forums.avsim.net/user_files/73560.jpgWhether I connect 1 to 3 or 1 to 2 , in both cases they light up.If I read the abovementioned doc and I look at the LEDS the cap have a 3 mm travel. I think this is for test and reset functions.(the electrical circuit drawings in the pdf file have 4 poles, mine have just 3).Question:Any suggestion on how I should use these properly?One has ESS BUS OFF in red, the other 2 just produce a white line. Were are these situated in the 737? I looked at every 737 panel (on the AGT website) but just can not find them.Thanks for any helpNorbert

Hi Norbet,I personally cant help you with your question but if have a look at this page of the website by D.C Allen it may be of help to you. If you need further info you could email him or anybody who has successfully implemented these Korrys into there sims like Matt Ford, James Price etc.http://www.737flightsim.com/737tech.htmlCheersGaz

Hi Norbert, By the looks of things, these switches where probably taken out of service due to a faulty press to test switch. If you can get them to light regardless of the pin connections used, then the contacts for the press to test must be fused internally. Normally, system voltage would be applied to pin 1 (going from your drawing), a wire would be hooked to ground from the press to test pin and the last one would go to the instrumentation or device responsible to trigger the lamp. By looking at the drawing, the input for this lamp is what is known as a sinking input, it completes the connection to ground. If you wish to use these, I would recommend soldering a jumper between the pins 2 & 3. If the press to test no longer works, no sense leaving it in the loop. You should be able to make it light by applying the required voltage to pin 1 from whatever output device you intend to use and connecting 2 & 3 to 0V.Hope this helpsChuckCYXU