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I bought a 2005 passat recently and had to cha ge the alternator on it. It's not returning enough current though and I read this may be because of poor ground connection. I bought for it a new connector and it came with two wires but the connector I took off only had one wire. Does it need a ground wire too? And if so where does it lead

Thanks for the help
 

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That connector should have only one wire.
Why do you think it is not charging enough ?
What is the battery voltage while the engine is running ?
If the starter works as it should, you don't have an alternator ground problem.
 
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