Date registered: Dec 2005
Vehicle: W211 E320 Bluetec R129 SL500 - $1300 car ........ Ford F350 6l
Location: CA Bay Area
Mentioned: 9 Post(s)
Quoted: 1127 Post(s)
13.5V is battery maintaining voltage.
On deeply discharged battery the charging voltage will go to 14V, but 14.5V some manufactures use for fast charging is shortening the battery life.
When you measure 13.2V on alternator what was battery voltage showing?
I would do a test with turning all lights, blower and rear defogger and observe how voltage change.