얼터네이터 교환 수리 사례
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2026. 6. 30. 작업
난이도 & 준비물
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How to assess battery charge level and alternator performance?
처리 내용
Measuring the state-of-charge of a lead-acid battery is non-trivial. The easiest way is to use a voltmeter . You'll need a digital meter with 3 1/2 digits of precision. Let the battery rest, disconnected, for 24 hours. Then measure the voltage across the terminals. According to http://www.phrannie.org/battery.html , anything over 12.60V is at least 85% charged. Maintenance free, gel, AGM, etc. batteries have different voltages. Batteries vary, so you'll want to get a few good measurements of your battery to establish its behavior. Use a smart charger to get to full charge, rest 24 hours, and measure. This is why people on boats sometimes have 2 banks of house batteries. One will rest while the other is used. When it's rested for 24 hours, they measure sate-of-charge, and then decide how to recharge - solar, wind, generator, etc. Then they charge it up, put it in to service, and disconnect the other bank to rest for 24 hours. You can also measure the specific gravity, using a hydrometer
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For example, it seems switching from some high wattage headlights to much lower wattage LED's frees up more of the alternator's power capacity. But, does this mean the alternator (or other electrical components like the voltage regulator) will start to run hotter? (to dissipate excess power via heat?) Or, does the decrease in overall electrical load simply get handled by just easing up the load on the engine making it easier to spin the alternator in the first place?