11.5V = Dead Cell?

Kern Dog said

My Charger was pushing THIS type of voltage when I had a bad battery:
View attachment 1715573501

Check out this chart:

View attachment 1715573503

Click to expand...

Ya, anytime the charging voltage is that high check your battery. State of charge, electrolyte level, and load test. Even corroded cable ends can cause issues as well as a bad ground (battery cable ground or regulator case to firewall ground)