Hi, I am designing a circuit for operating spdt relay when my 24 battery volt system voltage decreases from 24 volt to activate a relay with LM339, I have tested LM339 with 9 volt battery power plus terminal to its 3 no vcc + and ground 12 no to negative terminal of battery. And applied different inputs +5 and +9 volt at 4 and 5 inputs. But no output at 2 no appears by checking through voltmeter. If I supply 4.5+ and 4.5- at 3 and 12 no through capacitor and resistor voltage divider then -4.7 stays at the 2 no output and all the outputs. What could be possible problem