So I have an intermittent issue with my battery light coming on. I replaced the battery and was working fine for a bit. I do have a spare alternator, but the issue may be deeper then that.
So I have a diagnostic reader that connects to my phone (ZUS), so I am able to get real time readings. Yesterday I am getting a reading of 12.0-12.1 from the battery reading and the battery light is on. The odd thing is I am not getting ANY other readings from the port. No load, no speed, no RPM, no O2 mix, nothing. I can get battery readings when the car is off.
The car runs fine, lights work, and voltage never drops below 11.8-12.0 during my normal 15-20 min drive to work/home.
Once and a great while, I get a rough start, like the battery is low, but it will turn over. This is why I started to use the diagnostic ready to monitor the voltage reading in real time. Last time the battery light did this, the indicator just turned off and my voltage jumped to 13.9-14.1.
As stated I do have the spare alternator, but could this be a computer issue, due to the fact that the diagnostic port is not getting any signal other then from voltage?
Thanks in advance.