I re-called the thread when you replaced your alternator, Yuri.ber. You described it as "reconditioned." (Post # 17) https://www.clublexus.com/forums/ls-...ernator-2.html

Reconditioned is a different process from re-manufactured. You may want to verify exactly what was done when your alternator was repaired.

 

Finally, after 3 days in the shop I picked up my LS.
What was done:
Alternator. Denso remanufactured unit.
Oil Pressure sensor - old one was leaking.
One rear right O2 sensor. Denso OEM.
Right catalytic converter had a crack in it. Fixed by welding.
Extenctions were added to rear O2 sensors.
New Rear brakes: rotors, pads and a break wear sensor. Duralast Gold from local Autozone. Decided to give them a try plus warranty is good.
Total cost: $900 including labour.
I made a mistake calling an old alternator reconditioned, it's a Denso Remanufactured unit. Mechanic said it's the first time someone is back with a failed denso alternator.

 

How do you test the alternator?

 

 

Alright, that's pretty obvious, a test that confirms that alternator is still not dead.
I imagine if it's dead you'll notice pretty soon anyway.

I thought there was some sophisticated way of testing that would predict how soon the alternator is gonna die, maybe you could look at the alternator output with oscilloscope or something to see when it's beginning to get weaker...