Your Chevy S10 wiring diagram should be built to original blue print specifications to insure you don't have problems with installation, operation or car show judging. Wirings are made of copper wirings with plastic insulation.

The plastic insulation is porous. Oxygen, moisture and airborne pollutants pass through the insulation called oxidation increasing the internal resistance of the wires. Thus, wirings should be checked regularly to avoid electrical problems.