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13 When installing a whole-car wiring solution, you’ll often find extra circuits in the harness you won’t be using. It’s tempting to cut the wiring off at the fuse box or connector, but do yourself a favor and leave the wiring in place for future upgrades. Use a short section of shrink wrap on the cut wire end and then squeeze it shut with pliers. This will ensure the wires won’t short to anything and can easily be used in the future.