Voltage Issues - Complete Battery Replacement?

get all new batt's & be done.

 

They previous owner may have left the batteries on a charger too long and killed them. Don't ask me how I know. I will deny ever doing that.

I actually have a dead battery now. My 60amp alternator in my APU will not charge over 12.8 volts. Should be up around 13.7 to 14.0

 

Have 2004 Volvo vnl
When ac's on voltage drops from 13.9 to 13.2,3,4
Alternator fine,new starter,new batteries...
Any idea?
3 mech said leave it

 

check your voltage at the battery's and the alternator. you may find you still have full voltage at the alt but not the batterys or the batterys but not the cab. witch would indicate a bad connection between point a/b/or c

if you have the same voltage drop at the alternator as your dash gauge might pickup a spare alternator and throw it in the side box might be getting a bit weak.

 

Nothing wrong. Leave it!!!