얼터네이터 교환 수리 사례
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부품비
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소요 시간
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2026. 6. 30. 작업
난이도 & 준비물
증상
Bad ground cause alternator to output low volts?
처리 내용
Run the engine at 2k RPM. Turn on all the loads (blower on high, headlights on, rear defrost on, and so forth). Measure the voltage across the battery and the big bat alternator terminal to alternator case. There are two things that you are looking for. The charging voltage should be between 13.9v to 14.4v. Also the voltage at the battery and the voltage at the alternator should be within 0.5v of each other. If the voltage at the battery and alternator don't match. For example the battery reads 12v and alternator reads 14v. This means that there is an issue with wiring. While applying the same conditions as above. Put the black multimeter probe on the negative battery terminal (if possible dig it into the battery post, not the terminal). Put the red probe on the alternator case. Your looking for the voltage to be below about 0.5v. If the voltage is higher than that examine all the negative cabling for problems. Preform the same test with the positive side. Place the red lead on the pos
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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?