I purchased this unit off Amazon for use with a 24vdc battery to 12vdc load. Followed the instructions to set my output voltage and performed a test, 12vdc at my load (lightbulb). Disconnected unit and installed in car, when I turn the unit on I only get 24v on the output. I checked an the output is set to 12vdc but my VOM reads 24v and my voltage gage in the vehicle says 24v. Is this unit damage or ?