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Homepage. This page: 1930s/1940s service notes & specifications regarding Lucas voltage regulators.
Vintage & classic car reference section

Lucas voltage regulators.

This page features two original publications issued by Joseph Lucas Ltd in the 1930s, regarding their compensated voltage control regulators. Service notes and diagrams explaining their inner workings, and adjustments, are given. The first, slightly crumpled, single-sheet leaflet gives an overview of a typical Lucas voltage regulator that would have been found under the bonnet of many different British cars of the pre-war years. The second is a multi-page offering, also from 1938, that gives instruction on the maintenance of LR1, LR2, LR3, LR5, LR7, LRT7 and LRT9 regulators. Both leaflets originally lived in a garage that has featured a number of times on Old Classic Car - namely Welland's Garage, and is the actual garage shown at the top of this page, with its proprietor.
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(1) Lucas Compensated Voltage Control Dynamo Equipment.

  • Published by Joseph Lucas Ltd, Birmingham, England.
  • Date: 1938.

Lucas voltage regulators 1930s
Regulator adjustments

(2) Lucas Compensated Voltage Control Regulator Adjustment Instructions.

  • Published by Joseph Lucas Ltd, Birmingham, England.
  • Date: 1938.
Joseph Lucas Ltd - cover
Intro to control regulators
LR1 and LR2 Regulators
LR1 and LR2 Regulator diagram
LR3, LR5, LR7 regulators
LR3, LR5, LR7 regulator diagram
LRT7 & LRT9 regulator diagram
Settings chart

Please note.

Information presented in this section is provided as an aid to classic and vintage car owners only. It shouldn't necessarily be taken as gospel, more of a useful series of pointers. It may be that since these period instructions were created, better ways have since evolved to tackle work on the components being considered. Tips and advice may be given in these period articles, but inclusion doesn't necessarily suggest that anyone involved with OCC endorses the methods portrayed. A certain level of mechanical know-how will be required in undertaking work as described in these pages, and anyone unsure of their own abilities is advised to seek further assistance. Delve into your car's inner workings only if you feel confident in your own abilities, after all - a little knowledge can be dangerous, as the old saying goes.
No-one at OCC can be held responsible for breakages and injuries that might occur, while working on a vehicle following a read of pages hosted on the site. Dabble at your own risk. Where possible, the source(s) for the data shown will be given. If the accreditations are incorrect, or contravene your copyright, please let me know.
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