Repairing Appliance Cord - Polarity
I just cut a bad plug off the cord of an electric heater (oil type, maximum setting of 1,500 watts) and spliced a longer wire on. However, when I was preparing to attach the new plug and looked at the old one, I realized it was a polarized plug. How do I know which wire goes on which side of the plug, the wide side or the narrow side? Can I determine this without taking the heater apart? all wires are black.