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24 While we’re limited in room for this article we’d be remiss if we didn’t at least briefly mention wire sizing, as that is one of the top reasons for circuit failure. We see way too many cars with improperly sized wiring. It’s confusing, like gear ratios, that the larger the number, the smaller the wire. You can easily find wiring charts online and in books that explain the proper gauge for typical connections so you won’t be wiring up that electric fan with 18-gauge wiring.