Do you see the display indicating 12 volts? If you have a voltmeter, measure the output. Are you making use of the right output terminals, red for + and Black for -? If you wouldn't have a voltmeter, but you have got an LED, connect it with a resistor in series on the range from 300 to 500 Ohms. You can also have to reverse the polarity of the LED, it will be ON best in one direction. If all this fails, post the results. The equipment you're connecting could take a better present than your deliver is ready of. Be sure that the present limiting adjustment is just not set too low. If so, you are going to see the voltage to drop as quickly as you connect the equipment.