How do you determine the Gauge (AWG) of the Automotive Wire?

Make a small cut about 1/2″ long and remove the insulation on the automotive wire. Then you will need to count the individual strands of copper. Next use a micrometer and measure one of the strands. Also count the total number of strands that are present in the automotive wire. Look at the following information to determine the gauge of your automotive wire.

7/.028 = 20 (7 strands that measure .028 each equals 20 gauge)
16/.030=18
19/.029=16
19/.027=14
19/.025=12
19/.023=10
19/.021=8
37/.021=6

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