To choose an adequate wire gauge, determine the amp draw
(amperage) that the wire circuit will carry. Then
measure the distance that the wire will travel (length)
including the length of the return to ground (the ground
wire running to the chassis or back to a ground block or
battery. Using these two numbers, Amps and length,
locate the nearest gauge value in chart below. For 6
volt automotive systems typically a wire gauge 2 sizes
larger than what is shown should be used.
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