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Sooner or later, you have to replace your spark plug wires. Over time, extreme temperatures and corrosive fumes and liquids take their toll on your spark plug wires. If the wires are breached, your electrical system will be compromised which will not only inconvenience you, it can also be dangerous.
Many people overlook corrosion under the hood, especially if you don't know much about cars and never even pop the hood yourself. Check on your wiring and battery every few months (especially in the winter months) to ensure that everything looks clean and is in good repair.