New alternator not charging new battery?

2018 VOLKSWAGEN ATLAS
105,000 MILES • 3.4L • V6 • 2WD • AUTOMATIC
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RYANH89
  • MEMBER
  • 4 POSTS
The battery keeps draining every few days. i have replaced both the alternator and a new battery the new alternator is still not charging the battery.
May 2, 2023 at 8:08 PM
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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When the engine is running let's check the voltage output of the alternator.

This guide can help:

https://www.2carpros.com/articles/how-to-check-a-car-alternator

If the alternator is not charging let's check fuse # 18 - 5 amp and fuse G 400 amp in the fuse panel B in the engine compartment. Also fuse 1 - 400 amp in the fuse panel A on the left side of the engine compartment. Here are the wiring diagrams so you can see how the wiring system works for the alternator.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuses are good double check the connection at the rear of the alternator if that's okay, you may have a defective alternator. Here are the instructions for the replacement to ensure the job is being done correctly. Check out the images (below). Please let us know what happens.
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May 3, 2023 at 10:46 AM
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