ok im new to this circuitry stuff. this is becoming very frustrating to me. im making an led gear indicator for my motorcycle. 1 led lights up for first, 2 for 2nd, etc. i am tapping in the signal from the transmisson which puts out a different voltage for every gear ( so the bikes computer can know what gear its in). so this should be pretty simple: use 6 comparators with different refernce voltages for each gear using resistors. but i cant for the life of me understand my comparator. just building a simple circuit is killing me. for right now im just trying to get an led to turn on. im using a lm339AN comparator. i put 7.49v to the (-) and 3.74v to the (+) and i got no oput voltage. i reversed it, with 7.49v to the (+) and 3.74v to the (-) and i still got no oput voltage. even weirder, is if i wire it to get an output voltage, the other 3 outputs give voltage even though there is nothing attatched to thier inputs. am i missing something? any help would be appreciated. it seems so simple, but its just not working