Alternator OEM Volkswagen or OEM Nissan

The alternator was dead (as expected), and was replaced with a used one that I sourced locally from junkyard.

My 2005 Altima used to eat alternators. The first and second replacement were rebuilds or aftermarket, I don't remember the order. I finally paid for an OEM and that one lasted until I sold the vehicle a few years later. This is one of those parts that is better to stick with OEM replacements.

Nissan offered me around the same price for my 370z alternator replacement. I went to eBay and bout a used oem alternator from a rear ended total z with 3k miles on it for 80 bucks and changed it myself

The high rev voltage must be over 14 volts, so if not, then its the alternator. But make sure all connections clean and greased.

Eurovan exhibited similar behavior. Start and run fine until.... engine would lose power. Pull over and would die. Restart would be nothing. Sit for an hour or so and could restart and could get the few miles to home. Next day things could be normal or a repeat of slow down and die. This went on for a couple of weeks. The last fail found the battery to be toast even though only a year old. OK, so new battery. All good for the next few days then the gremlins return. New battery is now no good. Determined the alternator had developed enough play that when warm would start to short creating more heat and more of a short allowing it to eat the battery. New alternator and another new battery and all is and has been good.

I went and purchased an OEM alternator from Nissan and it is still not providing power. I have triple checked all the connections on the alternator, and have verified they are running 12V when the engine is shut off.

Mine has 69K miles. I've owned it for 4 years. Replaced the alternator and MAF sensor after failures. Keyless entry works only sporadically on the driver's door (lock switch already replaced - latch mechanism needs to be replaced, but for $$$).

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.

Spent 300 on an alternator to get the whole car apart just to find out it was the wrong one

even a simple job like changing the alternator is difficult due to where they place it. There's not a ton of space to work on the car in the engine bay.