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2007 2.2 D4D Toyota Rav 4 not charging battery even after alternator change + replacement battery

6K views 4 replies 4 participants last post by  TomKatt 
I'm not sure about the 2007 models, but at least starting around '09 the charging current is controlled by the ECU for fuel economy reasons - these aren't your old 1 wire charging system. The main power distribution to electrical loads flows throw a current sensing coil located in the main fuse box, and the ECU decides how much field current to send to the alternator to generate charging current.

It sounds like the 2 pins you found that have no voltage on them are likely the field winding supply... Without power going into the alternator field, you won't get charging current out. Also, bypassing the wiring to the battery with a direct connection might also bypass the current sensing coil, which could possibly cause the ECU to get confused and not "turn on" the alternator.

Certainly, the lack of the battery light turning on when you turn the key is a big clue - that should light even if nothing is running. I second Bigphil555's suggestion above.
 
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