12 Volt Generator

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Page created by T June 10th 2008:

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Lucas 12 Volt 30 Amp Generator on an EH Holden. Click to Enlargen. Photo by Daves59.

12 Volt Generator:

At the rear of the Generator is a small access hole for oiling the rear phosper bronze bush. This should be done every Tuneup. The front Generator Bearing is a Ball Bearing and does not get any routine maintenance. The Ball Bearing is greased during assembly.


The Regulator has 3 internal Relays.

Voltage Regulator:

The Voltage Regulator Relay controls the Generator Output Voltage by controlling the current fed into the Field Windings in the Generator.The current can be direct, fed through a Resistor or cut off. The Voltage Regulator Relay provides a large current, a small current or no current at all as required to keep the output Voltage at 13.8 volts.
Regulator for a Lucas 12 Volt 30 Amp Generator on an EH Holden. Click to Enlargen. Photo by Daves59.

Cut-Off Relay:

The second Relay in the unit is called the Cut-Off Relay. This Relay is pulled in when the Generator's output voltage is higher than the Battery's voltage. It opens when the Generator's Voltage is lower than the Battery's Voltage to prevent the Battery discharging through the Generator and burning it out.

Current Regulator:

Unlike Alternators, Generators cannot self limit their own maximum Current Output. As a result they have to be protected from excessive output. 

B connects directly to the Battery. F connects to the small Field connector on the Generator. The thick wire connected to the D terminal connects to the large D output connector on the Generator and is the Generator output. Click to Enlargen. Photo by Daves59.
 Once the current leaving the Generator reaches a high enough level, the Current Regulator begins to open to prevent the Generatorfrom becoming over loaded and burning out. The Current Regulator works by opening the Field wire connection to prevent generation of Output Voltage.  
The thin wire attached to the D connection is the Indicator Light wire. A ground wire runs between the Generator and the Regulator and is screwed to the Regulator on the far right hand side. Click to Enlargen. Photo by Daves59.


Lucas Regulator



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