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Q: The Alt wire get very hot on 2002 Volkswagen Jetta TDI

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Can anyone tell me why the wire that run from alt to the fuse panel on top of the battier to get so hot and when it got that hot my AC wont work which the fans run to the fuse panel also on top of the battier.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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