2015 Murano charging issues

[Jonesy96]

I’m new to the forum and sorry if this is re-hashing covered ground but I can’t seem to find an answer that fits my problem. Any help appreciated.
My 2015 Murano has gone into safe mode on me three times. The first time my mechanic (non-Nissan) said it was a bad battery. I replaced it and drove over 600 miles on the interstate before going into safe mode again and battery dying. I towed it home and charged the battery. Took it to local Nissan dealer who could not duplicate the problem and computer showed no codes. I have been using a BlueDriver OBD dongle to monitor the ecm voltage. When I cold start all is well. Approx. 14 volts at the ECM. Once I drive for a while the voltage drops off abruptly to battery voltage. When it is in this condition the battery charging lamp does not illuminate on the dash. When I turn the car off and put it in the ON position without starting the engine the battery charging lamp does not illuminate as it should. If I let the car cool off and repeat the process all is well for a while. The last time it went to limp mode when voltage dipped below 10 volts. The battery didn’t totally die and there were not any codes. I left the car where it sat overnight and came back. started car and got 14 volts.
Dealer suspects alternator but I’m not so sure since it is so intermittent and the battery lamp seems to be telling me something. After going through the MX manual I’m suspecting a shorting “L” circuit?? I haven’t been back to dealer because the OEM alternator is on back order. I read through the “disconnecting alternator from ECM” forum but don’t want to go that route yet.
Once again, any help is much appreciated!
Jonesy

[VStar650CL]

The battery lamp illuminates from an output on the internal voltage regulator. They're supposed to be failsafe, but in practice they're just usually failsafe. If it drops to 10V without lighting the lamp then it definitely sounds like a bad regulator, and the rest of your symptoms are pretty typical of a silicon regulator that's overheating. The "smart charge" wire can't completely kill output, just drop it to a minimum. So I'd say the dealer is probably right, time for a new alternator.

[Jonesy96]

Thanks for the info! I was searching for what powers the battery lamp as I figured that would lead to the source of the problem so this helps a lot. Now I’m waiting for Nissan to start delivering alternators. On backorder with no projected delivery date. Everyone says not to use aftermarket parts for this. I guess I’m driving a short range EV for a while!
Thank you again.

[VStar650CL]

Yep, it's a big job and nobody wants to do it twice. There are a lot of horror stories with remans (some of which I've endured personally with my customers), so IMHO you're doing the right thing.