얼터네이터 교환 수리 사례
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2026. 6. 30. 작업
난이도 & 준비물
증상
I shorted the alternator for a second with a multimeter set to measure current
처리 내용
No, you most likely didn't mess anything on the car up, though you might have fried your multimeter. If the vehicle still runs and nothing seems messed up, more than likely nothing is. Something you could do better. If you are going to measure voltage, you can do this directly without disconnecting the output lead on the alternator. You don't want to put your DMM inline in the circuit. You check this by putting the positive lead from the DMM to the output terminal and the ground lead to ground. This is basically the same as checking your battery at rest, but you're now checking it live. Another thing to consider is you should never run your vehicle without the battery connected. While this used to be a troubleshooting technique back when we had generators instead of alternators, these days you run a considerable risk of frying both your alternator and/or any electronics tied to the system. The battery acts as a buffer and helps prevents surges/spikes which could wipe everything out if
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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?