09 Altima Charging System problems

[mondoflex2151]

Bought this car 3 months ago w a battery and brake light that would come on n off randomly, got the charging system checked they said everything was good jus needed to charge or replace my battery. Drove it daily for 2 months like that it was getting worse over time I decided to get the alternator checked again at a different location same thing they said just a battery. I started noticing while driving it would sometimes feel like it jerked , the car was almost turning off but not completely while driving , this got progressively worse over about a week until I was at the drive thru getting food n I went to pull off n the feeling in the petal was gon n the car was dead , I changed the battery with a spare i had i was goin to replace the weak one with anyway but that on soon die as well since then i changed the alternator, 2 new batteries , positive terminal and fuse , negative terminal and ran an additional ground from that teminal to chassis. Same problem...I read on here about a battery current sensor causing similar problems, I need to know how I can check this out myself I read you can clip a wire running from alternator n it will allow alternator to work on its own , which wire am I too clip? N where? I will appreciate any advice thanks you guys in advance idk what else this can be

[VStar650CL]

First, put a voltmeter on it while it's misbehaving to confirm you still have a charging issue. The on-and-off generator light is pretty common when Nissan alternators fail, but if that's still happening after a new alternator then the replacement may be bad or you may have resistance (bad/broken wire or a poor contact) in the field circuit. If the gen light isn't coming on and the voltage reads 14~14.8V, then chances are the charging system isn't causing your issue.

To disable the smart charge, the Gray wire at the alternator pin 4 needs to be severed someplace between the alternator and IPDM. It's pin 76 at the IPDM, also Gray. The Yellow/Black wire is the field terminal and must read battery voltage at all times for the alternator to produce current. You can find the wiring diagram for the system starting on CHG-18 here...
https://www.nicoclub.com/service-manual ... %2FCHG.pdf
...and the IPDM pinout on PCS-26 here:
https://www.nicoclub.com/service-manual ... %2FPCS.pdf