Change system for vehicle battery with relay actuated charge indicator

A charging system for a vehicle battery, comprising:

• an alternator assembly having an alternator, main and auxiliary rectifiers and a voltage regulator, said alternator having a field coil and a three-phase generating coil, said main and auxiliary rectifiers being respectively interposed between said generating coil and said battery, and between said generating coil and said field coil;
• a switch for supplying said field coil with an initial exciting current from said battery;
• a voltage detector responsive to the voltage from said auxiliary rectifier, and having at least one element whose impedance is variable in accordance with said voltage;
• means for indicating whether the voltage generated by said alternator and applied through said auxiliary rectifier is above a predetermined value or not;
• and
• a switching circuit having a relay with a winding and normally closed contacts, said relay being arranged such that current flowing through said winding is controlled in accordance with the variation in impedance of said element, said indicating means being connected to one of said normally closed contacts so as to be energized when said normally closed contacts are in a closed state, said relay being energized when said voltage detector detects that the voltage from said auxiliary rectifier is greater than said predetermined voltage, to open said normally closed contacts.