Her dad is most probably correct about the alternator not providing sufficient charge abut it most probably is not an alternator fault.
Check the drive belt condition and tension and have them adjusted/replaced if necessary.
The squealing nise is from slipping belts and when that occurs, the alternator would be charging at lower than expected due to lower rpm.
If the beltings are good, check the harmonic damper on the crank pulley.
Sunday, June 17th, 2012 AT 10:17 AM