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Ignition Coil/Igniter
The ignition coil and igniter step up battery voltage into the high-voltage spark needed to fire the spark plugs, with one coil per cylinder on most modern engines.
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Buying Guide
Ignition Coil/Igniter Buying Guide
Charging, starting, and ignition components are among the most frequently replaced parts on higher-mileage vehicles. Most are straightforward to diagnose and replace — but buying the right part requires careful attention to application specifics like output rating, mounting position, and option content.
Alternator
The alternator charges the battery and powers all vehicle electrical systems while the engine runs. Symptoms of failure include a battery warning light, dimming lights at idle, and a dead battery despite recent charging.
Verify output amperage. Vehicles with many electrical accessories (heated seats, large audio systems, trailer lighting) require a higher-output alternator. Replacing a 130A alternator with a 90A unit from a base-trim donor will cause chronic undercharging. The amperage rating is stamped on the alternator case.
New vs. remanufactured. A remanufactured alternator is a better value than a used salvage unit — it's rebuilt with new brushes, voltage regulator, diodes, and bearings. A core charge applies; return your original for the deposit. Verify that the mounting ear positions and pulley diameter match.
Battery
Batteries are straightforward, but the group size (physical dimensions and terminal location) must match your vehicle's battery tray and hold-down. Cold Cranking Amps (CCA) should meet or exceed your vehicle's specification — especially important in cold climates. Used batteries are generally not recommended; battery health degrades invisibly and a used battery carries unknown remaining life.
Starter Motor
The starter cranks the engine to initiate combustion. Common failure modes include slow cranking (worn brushes or weak solenoid), no engagement (failed solenoid), and grinding (worn drive gear or ring gear damage).
Verify the mounting position and gear tooth count. Starters are specific to engine block bolt patterns, and the starter drive gear must match the ring gear tooth count on the flywheel/flexplate. A starter that fits the bolt pattern but has the wrong gear count won't engage properly.
Distributor
The distributor is found on older (pre-coil-on-plug) engines. It routes ignition timing from the coil to each cylinder. When replacing, transfer the cap and rotor from your original or purchase new ones. The distributor must be installed at the correct timing position — mark the rotor position before removal, match it during installation, then verify with a timing light.
Ignition Coil / Igniter
Modern vehicles use individual coil-on-plug (COP) ignition coils over each spark plug, replacing the single-coil distributor system. Coils fail intermittently, often under heat — a misfire code pointing to a specific cylinder (P030X) typically identifies the failed coil. Used coils are viable when tested; new coils are inexpensive enough that replacing suspected units outright is common practice.
Engine Fuse Box (Power Distribution Center)
The engine fuse box houses fuses and relays for all major electrical circuits. These fail from corrosion, rodent damage, or water intrusion. A used replacement must match your vehicle's circuit layout exactly — the fuse box is specific to the vehicle's option content and model year. Internal fuse positions and bus bar layouts are not universal. After replacement, verify all fuses are the correct amperage for your vehicle.
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Frequently asked questions
Quick answers on fitment, shipping, returns, payments, and how ShopEarl works.
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ShopEarl.com is a network of American auto part suppliers - salvage yards, aftermarket vendors, and powertrain remanufacturers.
Our mission is to make finding the right auto part easy, affordable, and environmentally friendly by giving quality used parts a second life and keeping them out of landfills.
We use a comprehensive vehicle fitment database that matches parts to specific makes, models, years, and engine types.
For critical components like engines and transmissions, we also require VIN verification for your vehicle to ensure an exact match. The VIN (Vehicle Identification Number) contains specific information about your vehicle's configuration that helps identify the exact parts it needs.
If you're ever unsure about fitment, our team is available to help verify compatibility before you make a purchase.
ShopEarl.com accepts the following payment methods:
- Major credit and debit cards, including Visa, MasterCard, and American Express
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- Google Pay
All payment data is encrypted using TLS technology. We never see or store your full payment information—only a secure token provided by our processor to complete your purchase.
ShopEarl.com offers free shipping within the continental United States. Shipping times can vary depending on shipping methods, and ‘unbolted’ used parts typically ship a day faster than ‘yard’ parts that have to be professionally dismantled from the vehicle first. You’ll receive email and text notifications every step of the way.
Delivery to commercial locations is always free, but larger parts that ship freight may incur surcharges if they are delivered to a residential address. You can always ship these for free to a repair facility or our team can help find a nearby commercial address for local pickup.
At the moment, we don’t offer expedited shipping options. However, we’re always looking for ways to improve our services, and we hope to offer faster shipping options in the future.
All parts come with a minimum 30 day return window from the date your part arrives. See full return policy for all the details.
A core charge is a refundable fee charged when you buy a part that can be rebuilt or remanufactured, like an engine, alternator, or transmission. It works like a deposit:
- You pay the core charge upfront when you buy the part.
- After installing the new part, you return the old part (the “core”) to the seller.
This system encourages recycling and helps manufacturers refurbish used parts instead of making new ones from scratch.
Used parts are OEM auto parts professionally dismantled by certified auto recyclers.
Remanufactured parts are used OEM parts that have been completely disassembled, cleaned, and rebuilt with new components where necessary. They're tested to meet or exceed original equipment specifications, and often come with warranties similar to new parts.
New parts are new, aftermarket components that have never been installed on a vehicle.