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.This video was made to test whether the defect is in the alternator or in the car's installation, in this case the defect is in the installation of my car, when the alternator turns when starting and the lamp goes out it is because the alternator is charging normally the lamp simulates the operation of the dashboard lamp that goes out when we start the engine, so now just examine the vehicle's installation and find out where the defect is, which may be a broken wire or lack of grounding among others, if you do not understand automotive electrical look for an electrician you trust, I made the video out of necessity and to show how to do the test. If you liked the video leave your like to help the channel, thank you very much!