I replaced the alternator as the original had quit charging, with a non-Nissan replacement. 
  
This quit after ~1month, and I eventually got around to sending it back; it was fine, they said, but sent me a new one anyway. 
  
This one quit charging; I took it to an auto-electrician, who says "it's the alternator - it's not charging" 
  
AS far as I can see, the charging cct is alternator <> battery <> volt meter/bulb. And that there's no connection to the ECU. So nothing could kill an alternator (the battery is all-but new, and is charging fine). 
  
I'm going to return the latest alternator to the supplier; they're not happy, as far as I know, but there's not much you can do wrong with an alternator! 
  
Does anyone recommend a replacement supplier ? Any traders who can help - pls PM me. 
  
Thanks, 
  
Simon R 
  
2004 350Z GTspec 
1974 Lawrencetune Morgan +8 
2004 Volvo V70. For when the other two aren't playing.