Oh, such a fun afternoon. I built the code reader and it wouldn't work. Tried switching components, still wouldn't work. Turned out that I had 2, yes TWO different, new, momentary switches that were both leaking a bit of voltage so the LED was always on no matter the switch position. Put a household toggle switch in the circuit and the code reader works like a charm. BTW, Radio Shack has a 12V LED in an assembly that is easier to use than the plain one. p/n 276-270A, $1.99

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