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The OPUS owner’s manuals calls for 10 gauge wire for the 12v+ and ground wires and 14 gauge wire for the ignition trigger. You need to keep in mind that the OPUS power supplies continue to operative during engine cranks for the sake of argument lets say 8 volts. At full capacity, 150 watts that would be 150 watts/8 volts = 18.75 amps. Under sizing the power supply wires might cause the wires to heat up (or start a fire) during high current draw time such as an engine crank.
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