14-02-2025, 09:33 AM
Hi again Jamie
To the best of my knowledge, the early C35A had the field resistor in a little casing on the dynamo, to suit early cut-outs with no resistor.
The later C35A used a resistor inside the cutout. The C35M (Late Ruby) also had the resistor inside the cutout.
Some cutouts had two resistors, which could be used for 3 different charge levels. This facility was not used by Austin, so both resistors are used in series. If you want to use a modern resistor, I would suggest a value of 2.7 Ohms and a rating of at least 3 Watts. A metal bodied (gold coloured) type is convenient, as it can be bolted to some convenient metalwork to act as a heatsink. These are usually rated at a higher wattage, but that is not a problem
To the best of my knowledge, the early C35A had the field resistor in a little casing on the dynamo, to suit early cut-outs with no resistor.
The later C35A used a resistor inside the cutout. The C35M (Late Ruby) also had the resistor inside the cutout.
Some cutouts had two resistors, which could be used for 3 different charge levels. This facility was not used by Austin, so both resistors are used in series. If you want to use a modern resistor, I would suggest a value of 2.7 Ohms and a rating of at least 3 Watts. A metal bodied (gold coloured) type is convenient, as it can be bolted to some convenient metalwork to act as a heatsink. These are usually rated at a higher wattage, but that is not a problem