SOLINOID OUT SIDE

Question

OLD ONE WORKS ONLY WHEN I PUSH IT DOWN MANUALLY. NEW ONE DONT WORK, CANT PUSH MAUALLY. I HAVE AC IF I LEAVE A BRICK ON OLD ONE. I THINK I NEED 24VAC ON TWO SIDE POLES? BUT I MEASURE VOLTS, ONLY GET .5. WHERE AM I SUPPOSED TO GET 24VAC FROM?