Had one do this on me and it was the alternator.
I went through 3, iirc on my 2006 mustang. Wound up with a used motorcraft (OEM) that I bought off eBay.
I had to order a motorcraft alternator which hasn't given me any problems 6 months later.
As far as replacements I've had good luck with Rock Auto Sticking to the better brands like Motorcraft, AC Delco, Remy, and Bosch.
The OEM motorcraft alternator in my focus lasted 14 years and its replacement, a Remy, lasted 6. If the difference in price between OEM and aftermarket isn't too big, and you plan on keeping the car for more than 5 more yrs, I'd go with the OEM.
Z1 Offroad has an OEM Nissan remanufactured for a good price, that's I what I went with.
The voltage regulator on the alternator is bad.
Go with an OEM unit by Motorcraft even if it's more expensive. Not somethin you want to do twice, learned this lesson with my Explorer. Threw on an aftermarket unit and it doesn't communicate with Ford's smart charging system correctly so it doesn't provide correct voltages as needed, therefore throwing a charging system warning constantly.
November of 2023 I had to replace the alternator. I purchased an aftermarket and had a mechanic friend install it for me. 6 weeks later it started acting up again and left me stranded. The battery tested good, alternator was bad. I returned the alternator and was warranted a second one. Roughly 2 months later, the battery light comes on while I am out of town. I pulled into a local parts store and had it tested. Battery tested fine. Alternator tested bad. The Nissan dealership says it is the alternator. But since I had not used a factory alternator that was the problem. Apparently the aftermarket alternators can not handle the load and are not set up properly.
I ended up replacing the alternator but it wasn\u2019t a genuine Nissan part and it didn\u2019t work.
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