Lucas C42-positive Earth (RAC026)


  • Brand: Austin Healey MKIII, Lucas C42 Positive Earth



  • Amps: 40A
  • OEM: Lucas
  • Shaft diameter: 15 mm
  • Voltage: 12V
  • Weight: 3,5 kg
  • RAC026 (For negative Earth use the RAC007)

Fitting Instructions


This 12V Dynalite unit replaces the Lucas C42 and is for positive earth applications only. It has an output of 40A compared to 25A of the original and weighs 3,5 kg, compared to 6 kg originally. A C42 for negative earth applications is also available.

To ensure that the dynamo on your vehicle is a C42, it should be stamped with ‘C42’ on the case. If you cannot find this, check the distance between the mounting flanges, it should be approximately 174 mm.

Dynalites are not supplied with a pulley or fan fitted. However, as the shaft diameter of the Dynalite is 15 mm, the fan and pulley from your old dynamo will fit.

When connecting the Dynalite to your vehicles electrics, there are two options:

  1. Use the existing control box as a junction box.
  2. Dispense with the original control box and purchase from us a dummy control box which acts a connection box, but also has an integral fuse. The integral fuse, fuses the output of the Dynalite, to protect the wiring of your vehicle in case there is a short circuit within your existing wiring. (This is the recommended option, due to the fusing capability).


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