I have a 2008 Ford Ranger 3.0 and have been chasing down a frustrating intermittent P0340 error and I'm trying to narrow things down electrically. Apparently sometimes these can be caused by a bad alternator.
I have one of those handheld battery testers and there's a charging mode test. I'm getting about 150 mV ripple. My understanding is that it should be usually below 100 mV.
Before changing out the entire alternator, I wanted to see if swapping the regulator + brush would change things. So I swapped out a regulator assembly from the junkyard and my ripple is 120 mV now. Still seems a bit high.
So my question is, on a Ford alternator is it solely the regulator and brushes that may affect the ripple, or could the stator (or contacts) affect that as well? Wondering if I need to replace the entire alternator.
Thanks!
I have one of those handheld battery testers and there's a charging mode test. I'm getting about 150 mV ripple. My understanding is that it should be usually below 100 mV.
Before changing out the entire alternator, I wanted to see if swapping the regulator + brush would change things. So I swapped out a regulator assembly from the junkyard and my ripple is 120 mV now. Still seems a bit high.
So my question is, on a Ford alternator is it solely the regulator and brushes that may affect the ripple, or could the stator (or contacts) affect that as well? Wondering if I need to replace the entire alternator.
Thanks!