For Models:
- Austin (1968-73)
- Capri (1970-73)
- Cortina (1971-72)
- Cricket (1971-72)
- Jaguar (1970-73)
- MG (1968-73)
- Rover (1970-73)
- Sunbeam (1968-70)
- Triumph (1968-73)
DESCRIPTION
4TH REGULATOR
Regulator unit provides highly stabilized output control and operates satisfactorily at high temperatures, due to use of silicon semi-conductor devices. There are no moving parts, unit does not regulate any maintenance except the molded cover should be kept clean. Regulator is not repairable. Regulator used on 11AC alternator applications
INTEGRAL REGULATOR
Regulator is used in "ACR" type alternators and is an integral unit. Regulator is not adjustable or repairable. If testing shows improper regulator function, it must be replaced
APPLICATION
Model Lucas Model No. (Part No.)
Austin America (1968-71).................... RB 340 (...)
Austin Marina (1973) ........................ Integral
Capri 4 Cyl (1970-73) ....................... 4TR (D1RY-10316-B)
Cortina (1970) .................................. Integral
Cricket (1971-72 .............................. Integral
Jaguar (1969-73)
All 6 Cyl (1969-73 .......................... 4TR (37423)
12 cYL
XKE W/O AC (1971 ................... 4TR (37423)
XJ12 (1973) .............................. 11TR (...)
MG (1968-73)
MGB & MGB GT
1968-71 .................................... 4TR (37527)
1972-73 .................................... Integral
Rover (1967-73)
2000 TC & SC
1967-69 .................................... (37423)
1970 ......................................... 4TR (37517)
1971 ......................................... 4TR (37548A)
3500S
1970 ......................................... 4TR (37548)
1971 ......................................... 4TR (37548A)
Land Rover
1971 ......................................... (...)
1972 ......................................... (37565)
1973 ......................................... (...)
Sunbeam (1968-70)
1968-69 ....................................... 4TR (35727)
1970 ............................................ (37344)
Triumph (1968-73)
Stag (1971-73) ............................. 4TR (37423)
All Other Models (1968-73) ............. Integral
TESTING
Battery must be in fully charged condition in order to ensure accurate checking or adjustment in regulating oltage.
4TH REGULATOR
Run alternator at charging speed for eight minutes. Connect a voltmeter across terminals of the battery. Turn on parking and tail lights, start engine, and slowly increase engine speed until alternator is running at approximately 3000 RPM (1500 engine RPM). Voltage reading should be 13.9-14.3 volts or normal ambient temperature.
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| REAR VIEW OF 4TH REGULATOR |
INTERNAL REGULATOR
Connect a voltmeter between main terminals of battery. Install a 0-60 amp ammeter in series with alternator main output cable, at its connection with starter solenoid. Starg engine and run alternator at 5000 RPM until ammeter shows an output not exceeding 7.5 amps. Voltage reading should be 14.1 - 14.5 volts. If reading obtained is unstable or outside specified limits, the voltage regulator is faulty and must be replaced.
ADJUSTMENT
4TH REGULATOR
Remove the control unit mounting screws. Invert unit and chip away the sealing compound which conceals the voltage (potentiometer) adjuster. Check that voltmeter is still connected across battery terminals. Start engine and run alternator at 3000 RPM (1500 engine RPM), turn voltage adjuster on regulator clockwise to decrease setting. A small movement of the adjuster will make appreciable difference in voltage. Recheck setting by stopping engine, then restarting and running at check speed.
