When you are done with installing/wiring the new plug, check the resistance with your multimeter, end to end of the 50 ft cable. Check each of the 4 wires. Resistance should be less the 0.2 ohms which is as low a my fluke meter typically reads. If is is more you need to check both ends and make sure the wire is clean and bright an not clamped on to the wire insulation. I coat the wires after wire brushing clean with dielectric grease before assembly into the plug.
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