Trailer Connector has 4 Pins But 5 Wires
But if it has a 4-Way, whether it is 4 wires or 5 wires, then the circuits have already been converter (combined turn signals and brake lights) so no additional cutting and splicing should be required. Apart from all of that it also sounds like there is a short and a possible ground issue. A short could occur during the cutting and splicing ...
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