07-01-2019, 10:56 PM
Disconnecting the battery with the engine running and the dynamo charging is not a good idea.
The three brush dynamo tries always to supply the current for which it is set up and increases the voltage to achieve this.
It happened to me in 1967 when I bump started my 1934 tourer down the drive at 4am in the winter, intending to drive from Cambridge to Dundee. The battery failed and went open circuit. The sidelights were on, they lit up so bright that they illuminated the whole garden then failed. The ignition warning light lit the whole inside of the car then failed.
I shorted out the dead cell and drove to Dundee on 4 volts. An interesting journey, but that's another story.
The three brush dynamo tries always to supply the current for which it is set up and increases the voltage to achieve this.
It happened to me in 1967 when I bump started my 1934 tourer down the drive at 4am in the winter, intending to drive from Cambridge to Dundee. The battery failed and went open circuit. The sidelights were on, they lit up so bright that they illuminated the whole garden then failed. The ignition warning light lit the whole inside of the car then failed.
I shorted out the dead cell and drove to Dundee on 4 volts. An interesting journey, but that's another story.
Jim