If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Landing Gear Lights-Need Wiring Help
Hello,
I'm replacing the landing gear down indicator lights and the transition light in a Lancair 235. The installed lights are the kind that snap into a hole in the panel, and the bulb is not accessible without removing the entire light fixture. I'm replacing those with the push-to-test type of lights found on most certified aircraft (MS25041). The advantage being that one can check a non-illumnating light to determine wether the circuit is open, or the bulb is bad. The bulb can also be replaced from within the cockpit. The dilema I am having is how these lights wire up: There are three terminals on the fixture Vs. two on the old ones. One terminal in the center and two on the outer edges. If I wire the center(+) and one of the outer edges(-) to the circuit the light comes on when its supposed to. However, the light won't illuminate when the push-to-test feature is used (light pushed in). What does the un-used terminal get wired to? An always on supply (+)? I'm afraid to try it for fear of shorting something out. I welcome any advice from someone who has wired these up before. thanks in advance, Bill Gilbert N235JR |
#2
|
|||
|
|||
"BG" wrote in message news:7dx%a.1164$kP.156@fed1read03... Hello, I'm replacing the landing gear down indicator lights and the transition light in a Lancair 235. The installed lights are the kind that snap into a hole in the panel, and the bulb is not accessible without removing the entire light fixture. I'm replacing those with the push-to-test type of lights found on most certified aircraft (MS25041). The advantage being that one can check a non-illumnating light to determine wether the circuit is open, or the bulb is bad. The bulb can also be replaced from within the cockpit. The dilema I am having is how these lights wire up: There are three terminals on the fixture Vs. two on the old ones. One terminal in the center and two on the outer edges. If I wire the center(+) and one of the outer edges(-) to the circuit the light comes on when its supposed to. However, the light won't illuminate when the push-to-test feature is used (light pushed in). What does the un-used terminal get wired to? An always on supply (+)? I'm afraid to try it for fear of shorting something out. I welcome any advice from someone who has wired these up before. thanks in advance, Bill Gilbert N235JR \ I've not installed one of these before, but what you need to do is check the terminals with a volt ohm meter. Find out what is normaly open and normaly closed, then go from there. -- Jim in NC-- |
#3
|
|||
|
|||
"Morgans" wrote in message ... I've not installed one of these before, but what you need to do is check the terminals with a volt ohm meter. Find out what is normaly open and normaly closed, then go from there. -- Jim in NC-- I should have included more detail. In the position that you are not pushing on it, find out which terminals pass the electricity through the bulb. Next, push the bulb, and find which terminals cause the juice to go through the bulb. Use the terminals that were not causing the bulb to light in the un-pushed state, but lighting when you push it, for hooking to the always on (with master on), and the other terminals to the indicating circuit. Does that make any sense? -- Jim in NC-- Yep, sure does. That's what I thought; that the un-used terminal, when the light is on, would have to be hooked up to a "live" curcuit. Thanks for confirming my thought. I'll have to try it out next. Actually, I just saw some lights in Aircraft Spruce that allow for bulb replacement, but aren't push to test. Simpler to wire up and gives me the light bulb check I need in case a gear light doesn't go on. Bill G |
Thread Tools | |
Display Modes | |
|
|