is that enough voltes to start a ford e350 ambulance
12.3 voltes on 1993 Ford E-350
most diesels have two batteries because it takes more juice to start them you never said if were having a problem starting if you do load test the battery to see if it holds voltage
1 more answer
12.3 voltes is okay as long as it does not drop lower than 9.5 voltes while cranking.