I want to replace a cord end(120V grounded). The ground is marked green but the hot and neutral are both black. How can I determine which is which since there is no power running through? The other end is not accessible.
The marked wire is the neutral, whether the marking is a raised ridge, ribbing, or writing. So in your case, the wire with the white writing should be the neutral. That said, Bondo's right, it probably doesn't really matter with a block heater, but you might as well hook it up the right way if you can.
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