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The ddiameter of No. 14 wire is 64 mils. What is its area in CM and in SM?
Imagine the wire is straight, now cut through at right angle to the centre line, the exposed surface is the cross sectional area, on a round wire it = pi * radius2 (area of a circle)
All you have to do is turn on the car into ignition area and grab a voltage meter. Find positive first, to do this, find a good ground spot on your vehicle, such as a screw or metal, than with the red meter wire, go around til you find one that makes the volt meter go up... that is your power wire. Now, go from that wire, and check for your ground wire. Hold the positive wire onto the positive spot on your vehicle, and use the black wire to check until the meter goes up, that is your ground. Now you are done.
A circle.
Area of cross section of wire= Pi X D2/4=3.14 X (0.0625)2/4=0.0031