Alternator Regulators - HITACHI: Description

The regulator system consists basically of a voltage regulator and a charge relay. The voltage regulator has two sets of contact points, a lower set and upper set, to control alternator voltage. An armature plate placed between the two sets of contacts moves upward, downward, or vibrates. The lower contacts, when closed, complete the field circuit direct to ground. The upper contacts, when closed, complete field circuit to ground through a resistance (field coil), and thereby produces alternator output. The charge relay is similar in construction to voltage regulator. When upper contacts are closed, ignition warning lamp goes on.

Fig 1: Test Connections for Voltage Regulator

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