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Alternator, starter, and battery shown side by side for comparison Electrical System Parts 1 min read
Verified 2026 Guide

Alternator vs Starter vs Battery: Which One Is It?

When a car will not start or dies unexpectedly, the cause is usually one of three parts: the battery, the starter, or the alternator. The quickest way to tell them apart is by the pattern. A battery problem usually means the car will not crank after sitting, but starts fine after a jump. A starter problem usually means a single click or nothing when you turn the key, even with a good battery. An alternator problem usually means the car starts fine but then dims, struggles, or dies while running. These three parts are constantly mistaken for each other, and replacing the wrong one is a common, expensive error. This guide gives you a clear way to tell which is which.

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Used OEM transmissions on pallets ready to ship to buyers across the US Transmissions 3 min read
Verified 2026 Guide

Where to Buy a Used Transmission: 7 Options Compared

You can buy a used transmission from seven main sources in the US: specialty online used-parts retailers, local transmission specialty shops, remanufacturers selling direct, full-service auto recyclers, eBay Motors, self-service salvage yards, and Craigslist or Facebook Marketplace. Transmissions are different from most used parts in three ways that change which channel makes sense: many sellers charge a refundable core deposit, whether the torque converter is included varies by seller, and the unit is heavy enough that freight cost is a real line item. This guide covers all seven honestly, including where competitors serve certain buyers better than we do.

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Engine control module being tested with a diagnostic scan tool Used Engines 1 min read
Verified 2026 Guide

Signs of a Bad ECM: 7 Symptoms to Watch For

The most common signs of a bad ECM are an engine that will not start, a persistent check engine light, stalling or rough running, erratic or unexplained engine behavior, a sudden drop in fuel economy or performance, failed communication with a scan tool, and multiple unrelated trouble codes at once. Here is the honest part most articles skip: the ECM is one of the most over-diagnosed parts on a vehicle. Because it controls so much, almost any electrical, sensor, wiring, or ground problem can produce symptoms that look like a failing computer. Since an ECM is expensive, ruling out those cheaper causes first is not optional. This guide covers the symptoms and, just as importantly, why the ECM is so often wrongly blamed.

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