A wire gauge chart (search for "AWG chart") will tell you diameter of wire, gauge, ampacity, &c (make sure you look for the number of strands in your wire as that will affect measured diameter). A dial caliper or micrometer will tell you what you have.
Edit: Some electricians/audio-installers can give you a close estimate by eyeballing it.
Edit 2: There is a power distribution block on the front left side of the battery. It may make a better place to attach the power wire than the battery terminal. Oops. Looked at the pics again and you are using the block. Doh!
Last edited by SouthArk370Z; 01-12-2015 at 09:59 PM.
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