Lucas Type RB106 Dynamo Generator Charging System Control Box

Lucas part no RB106 RB106/1 RB106/2 Compensated Voltage Model

Description

12 volt 22 Amp mechanical voltage regulator

Cross reference part numbers

OE: Lucas 37066 , 37132M, 371388, 37139, 37139E, 37182K, 37182L, 37183, 37183M, 37283, 37290, 37290d, 37290e, 37290f, 37294, 37384, NCB101 .

Aftermarket: HC130052, VRG352

Classic Car Applications:

Austin, Austin Healey, Austin Morris , Ford, Morris, Mini, MG ,Jaguar , Landrover Series 1,

Classic Tractor Applications:

Fordson Major, Fordson Power Major, Fordson Diesel Major, Fordson Super Major, Fordson Dexta,

Classic construction plant applications:

JCB 3C with Fordson engine.

Terminals: A1 , A, F - Field, D - Dynamo, E - Earth.

Checking and Setting the RB106/2 Voltage Regulator
(Reference source: Joseph Lucas publication TPC1 October 1967)

1. Remove battery leads from control box terminals A and A1.
2. Connect voltmeter between terminal D and Earth
3. Run generator at charging speed. Check that voltage is within appropriate limits (at 68 degrees F)
Set speed 3000rpm.
Voltage Setting 16.0 - 16.6 volts.
If voltage settings are outside the appropriate limits ;
Remove control box cover
Adjust voltage regulator setting by turn adjustment of screw at back of regulator.

1. Setting the cut out and checking the generator output

Connect ammeter between disconnected leads and control box terminal A

2. Cutting in voltage

Connect voltmeter between D and Earth
Switch on driving lamps
Start engine. Increase speed gradually.
Cutout points close and voltmeter reading drops slightly.
Cutting in should occur within the limits : 12.7 to 13.3 volts.
To set: Turn adjusting screw at back of cutout.

Checking Generator Output

Increase engine speed and observe ammeter reading. Generator should increase output with speed. (Actual reading depends on battery charge and electrical load.)

Checking Reverse Current

Gradually reduce engine speed.
Ammeter reading should fall until it indicates a discharge.
Discharge or reverse current should be 3-5A.
Ammeter needle should return to zero when cutout points open.

Checking for excessive voltage drop on the supply line

Connect voltmeter between generator D terminal and Battery supply terminal.
(-ve terminal for positive earth system)
(+ve terminal for negative earth system)
Increase engine speed and observe ammeter reading.
When 10A (approx) is indicated, the voltmeter reading should not exceed 10% of the battery voltage.

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