01-06-2020, 09:25 PM
(This post was last modified: 01-06-2020, 09:28 PM by Bob Culver.)
On the Seven one main brush is earthed so only two wires emerge.
I assume you do not have an early 4 pole (4 field coils) dynamo where the brush locations differ and there can be further complications. Otherwise the only normal resistance vaguely about 1 ohm is the field coils.
The merits and not (esp in age of LEDs) been extensively covered before. Also the many 12v conversions from the very simple retaining 3 brush to the complex with electronic regulators and rewound fields. Many have retained the original field but with the voltage applied at least twice the original some particular provision is necessary to moderate the field current. As with the car on 6v great care is necessary not to exceed max armature current. Note the original lamp bulbs were only 18w each.
All should be available via Search.
Some opt for a token charge in the car and maintain with a smart bench charger.
I assume you do not have an early 4 pole (4 field coils) dynamo where the brush locations differ and there can be further complications. Otherwise the only normal resistance vaguely about 1 ohm is the field coils.
The merits and not (esp in age of LEDs) been extensively covered before. Also the many 12v conversions from the very simple retaining 3 brush to the complex with electronic regulators and rewound fields. Many have retained the original field but with the voltage applied at least twice the original some particular provision is necessary to moderate the field current. As with the car on 6v great care is necessary not to exceed max armature current. Note the original lamp bulbs were only 18w each.
All should be available via Search.
Some opt for a token charge in the car and maintain with a smart bench charger.