Quote:
Originally Posted by rick55
.... it is still a 6 volt system if there is no ballast resistor anywhere.
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The first two photos are of two different styles of ballast resistor (US not Lucas).
If you have one it would have the ignition power wire from the key switch attached to one terminal and the wire on the second terminal goes to the ignition coil. The inside of the resistor has a very fine wire wrapped around a ceramic support, which is usually visable.
rick55 is correct about the polarity of the coil, it should match the polarity the car was last set up for. He is also correct that the polarity of the car doesn't really matter, except for the Coil and Clock if the car has one, they are the only polarity sensitive parts.
Since the car has been without a battery for some time the generator may need to be polarized anyway.
Polarity info at this link...
https://www.ctci.org/gilsgarage/6to12.php
If this were a US car that had been converted from 6 to 12v the starter solenoid would have been changed. The 6v solenoid has three terminals and the 12v version has four terminals.
One of the battery cables should be connected directly to one of the larger terminals on the solenoid. Your (Lucas?) version may or may not look the same.
There would also be a wire connecting the "I" terminal of a 12v solenoid to the ignition coil.
Disclaimer: Lucas electrics exist in their own world that only marginally resembles reality elsewhere.
Due to the one-off nature of the car:
rick55, Twinspinner and
mercman from oz can probably offer you better insight than some of us with only US cars & parts as examples.
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