Thermo King T-500R Maintenance Manual page 263

Condition
Battery is not recharging
Possible Cause
Loose alternator belt
Loose connections in electrical
system
Worn brushes in alternator
Voltage regulator faulty
Battery defective
Alternator defective
Dirty battery terminals
Mechanical Diagnosis
Remedy
Tighten belt
Check all electrical connections and
charging system
Repair
Replace
Replace
Repair or replace
Clean and retighten
13-5