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2026. 6. 30. 작업

난이도 & 준비물

난이도 어려움⏱ 예상 90~180🔧 특수공구

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Grind/Crunch Sound Near Alternator (video)

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The sound you are hearing is most likely the bearings going (gone) bad in the alternator. As @resident_heretic suggested, removing the belt and checking the alternator by hand is a good suggestion. You can also isolate the sound by using an automotive stethoscope (can be bought at Harbor Freight for $5). Even if you don't have that, you can isolate the noise by using a long, flat tipped screwdriver. Place the handle up to your ear (can even rest it on the bone behind your hear), then place the tip on the alternator housing and see if this amplifies the noise. You can touch it to other portions of the engine to see if the noise is there, as well. Be careful when doing this, though ... do not wear any dangling jewelry, ties, or loose fitting clothing. It's really easy to get this stuff caught up in the fan belt or other moving parts. Would pretty much ruin a good day otherwise. I would bet, since you have a v-belt accessory system, you do not have a tensioner pulley or idler pulley on it

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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?