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how can a car alternator be tested with out being removed from the car?

I want to test my car alternator but i aint really looking to remove it from the car. A few people have told me to turn the car on and then remove one of the wires from the car battery. Would the really work and if so which wire should i remove the positive


Never disconnect the cables while running, most modern cars that stunt will cost you money. To test the charging system requires special tools, going to the local parts store and getting a test will work and be easiest if you're looking to do this for

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