It should read 14v if the IMA system is supplying it with power. If it is uner load and the 12v battery needs charging and the IMA battery isn't supplying power, the voltage would be lower but not that low. 11.6v should be triggering the 12v charging fault indicator.
My Scangauge pretty much always reads between 13-14.2v
2000 MT Insight "Silver Sipper"
2000 MT Insight Silver "Clone"