decosse Posted March 29, 2005 Report Share Posted March 29, 2005 My charging system is having a problem; Battery volts were low (10.5 or so measured on the DIC) and I took car to the parts store for quick diagnostic where they indicated the battery was good (less than a year old) but there was no alternator charging voltage; I did some re-tests to check on the conditions after re-charging overnight: Off-load battery was at 13.2V (measured ~ 0.5V less on the DIC); after starting the car, the indicated voltage on the DIC dropped below 12V; it seems to handle load well enough (lights & A/C on); if I increase the engine RPM there is a delayed reaction on the voltage displayed on the DIC - it will increase gradually at a rate of 0.1V per second into the 13.7 range, then as I back off the throttle it will drop again. There are no error codes for insufficent charging etc or L-block issue. So - obviously the alternator is making voltage but still points to a problem - maybe one of the diodes blown? Regulator issue? Is it possible to replace just the voltage regulator? The alternator was replaced a few years ago and has maybe 50K miles tops? Should I just bite the bullet & replace the whole thing? How does the battery/alternator tester they use differntiate between battery voltage & alternator charging voltage when they are hooked together - does it look for an AC component on the charging volts??? This thing as everyone knows is a PITA to get out or I would attempt to take it out & apart to get some further insight. The + cables at the battery don't look great so I will probably replace those along with any other repair that's necessary, but for now have cleaned them up reasonably well. Opinions/confirmation on the diagnosis and repair? Link to comment Share on other sites More sharing options...
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