index
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Car won't crank or start? Follow this order of checks, from battery and cables to relay, starter and immobilizer, and know when to stop and call a pro.
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Learn how to run a starter current draw test safely, what amp readings to expect, and how to tell a bad starter from weak cables or a tired battery.
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Car clicks and won't start? Learn what rapid clicking versus a single click means, how to tell battery from starter, and which tests to run before buying parts.
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Solid, overrunning clutch (OAP) or decoupler (OAD)? Learn how each alternator pulley works, how to identify yours, and what to match when replacing it.
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Alternator got wet from a wash, a puddle or a flood? Learn which symptoms matter, what to do first, when to replace it and what it costs in the US.
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Are aftermarket alternators good? Learn what drives quality, how rebuilt units compare, which tests and warranty terms matter, and how to avoid a repeat failure.
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Step-by-step alternator undercharging diagnosis: check the belt, battery and grounds, run a voltage drop test, and learn when low output at idle is normal.
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A bad alternator ground can mimic a failed alternator. Learn the symptoms, how to run a voltage drop test on the ground strap, and when to replace the part.
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Headlights dim or flicker at idle and brighten when you rev? Learn the likely causes, the voltage readings to check, and when it means a new alternator.
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Find out how many amps your alternator needs: add up your electrical load, keep it under 80% of rated output, and know when a higher-amp unit makes sense.
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Learn how a dual alternator setup works, when a second alternator makes sense, and how to size belts, brackets and wiring so the build charges reliably.
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Can an alternator drain a battery? Yes, but it's rarer than you'd think. Learn the key-off draw test, voltage checks and signs that point to the alternator.
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