i am trying to simply get a LED to light up when i turn on an air compressor in my jeep. I drew up a simple diagram of the circuit, i left out the fuse and the pressure switch as they have no bearing on the circuit that i can see. The led is connected the correct way, has the resister built in (from radio shack) and is not blown (still works if i don't put it in the circuit). but it does not turn on when i switch the compressor on. I am feeling like the kid in "breakfast club" whose lamp wouldn't light up when he pulled the trunk...don't make me get a flare gun!!!!