Good day. Assemble a reflector with a 400w sodium light. I put it together in the workshop and it worked correctly. I connect the ballast with the reflector on the other side and it doesn't turn on anymore. I measure tensions and check connections finding nothing. I go back to where I bought the materials and they tell me that the ballast was shorted because it plugged in with the polarity reversed. Is this correct? LUMENAC brand Box 400 model