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Jared D
Jared D, ASE Certified Technician
Category: Nissan
Satisfied Customers: 1914
Experience:  Shop Supervisor at County Fleet
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I have a 2005 nissan altima. it loses power and goes into

Customer Question

I have a 2005 nissan altima. it loses power and goes into creep mode if the a/c and lights are on, pull over let the car run for a few with everything off and your good again. Alternator & battery are new. the diagnostic at auto zone says battery is fine when idling but when you turn on the ac it says battery to low to run the charging system test. Alt load tests fine
Submitted: 1 year ago.
Category: Nissan
Customer: replied 1 year ago.
All fuses and fusable links are intact and MAF sensor cleaned
Expert:  Jared D replied 1 year ago.

That sounds odd that the alternator will pass a load test but you can't load test the system with the AC on. Can you test for voltage draw with the AC on? You will need an induction clamp and a multi-meter.

Customer: replied 1 year ago.
Induction clamp?
Expert:  Jared D replied 1 year ago.

An induction clamp will measure the amperage flow from the alternator/battery. This will tell you if there is some sort of voltage stealing short in the AC or something that activates along with the AC, like the AC clutch or cooling fans.

Has the battery been tested on a load tester?

Customer: replied 1 year ago.
The battery was replaced two weeks ago. And it tested fine yesterday
Expert:  Jared D replied 1 year ago.

So this only happens when you turn on the AC? What if you turn on the heat full blast and the high-beams? That should be more of an electrical load than the AC.

Customer: replied 1 year ago.
Turned out to be the alt after all. Took it to another parts store and ran a load test with it on the car. Only put 11v with the AC on. Replaced it and everything is fine. Thanks
Expert:  Jared D replied 1 year ago.

That's where I was leaning- makes sense. It throws you off when the testers says "ok" but it just doesn't work right.

Please let me know if you need help in the future.

Customer: replied 1 year ago.
Thanks again
Expert:  Jared D replied 1 year ago.

Thank you!

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