I work for a company called Shockwatch and I am working on a simple indicator for my test rig. Our units interrupt to the key switches on forklifts and monitor impacts and other variables on the trucks. In order to operate a truck containing one of our units you must log-in with a key on the unit which closes a driver enable relay allowing the lift to start. Currently the only way to test the driver enable relay in-house is with a meter. I am wanting to put an LED on my test rig that will light with the driver enable relay. However, we power our test units at 12 volt dc which is too much for the LED to handle. All I have at my disposal is tons of resistors at various sizes and a handful of caps (25v 100uF). I tried using 10m resistors and the LED wont light when I apply power. When I used the resistors I get a voltage drop from 12 to 2.5 which seems ideal but why wont the LED light? My guess is it is dropping the current too much. I am new to designing circuits and any suggestions would be great.