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I assembled a jim stim, first timer here, and have no power led light. One side of led has power. Nothing on other side coming out. Using a 9v battery. Checked all leds with diode option on multimeter after board was assembled. Cant get any to light up. Are leds directional? If so, how to tell? I read note in instructions not to overheat ,so i was careful to not do so, but new to all of this. I have a thread in general, newbees on megasquirt forum.