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I have an old evinrude scout trolling motor. the speed control switch only works on high. I have two motors, one is saltwater and the other is a freshwater unit .I'm trying to put the speed control rotary switchs from the freshwater unit onto the saltwater unit. these two units appear to be identical except one is white and the other is black in color. the problem is the freshwater speed control has 3 wires and the saltwater unit has 4 wires. freshwater has an orange, black and yellow wires and the saltwater unit has two black and two red wires. how do I make the change?