Wranglerman
New member
I think some people were reporting that they have seen 12s and 13s while the Jeep is running. Maybe gecko can clarify, but it seems that the JL has electronics in between the alternator and batteries so it can disengage sort of, and not send a charge while the vehicle is running, allowing the running voltage to dip below the 14s....ie a smart alternator.
Wrangler, thanks for the tip. I just performed your tests and all is well. With the engine off, the main battery reads 12.63v across the negative and positive posts and the ESS battery reads 12.65v when isolated by pulling the negative lead.
I do have a Taser with ESS Kill activated and I tested that by pushing the dash button to turn ESS on and it does work properly. No error messages about battery charging or anything else. So it looks like I am in good shape. Appreciate the help.
I’m glad it’s all working correctly, I still have no idea why some are seeing 14.2-14.4 all the time as from what I have been told by several FCA techs that’s not normal and not the way the system was designed to charge, the charging amount is supposed to vary based on the condition of the batteries.
For me today when I first got in my Jeep the displayed EVIC voltage was 13.4 and within 20 mins of driving it dropped to 12.9 and by the time I got home it was 12.6-12.8 so I just checked the combined voltage of both real quick and I read 12.75 and I am currently running double programmers for testing