Greetings,
Ok, so where were we. Talking about an oil cooled 6v (could be 12v) ignition coil.
![term.jpeg](./download/file.php?id=104559&sid=6a379fcec020a605deec6cb9d7e3b588)
- term.jpeg (120.66 KiB) Viewed 1022 times
You should be able to see;
a) one single lead which is the low voltage input to the primary coil, let's say of 100 turns
b) two leads which is a connection between the low voltage primary and one end of the secondary coil, this terminal external post connects to the switched on/off earth, typically contact breaker points. Remember that the secondary is composed of many more coils than the primary and is insulated from but wrapped around the primary coil
c) in the top corner, the high voltage output leading to the plug or distributor cap.
![sec out.jpeg](./download/file.php?id=104560&sid=6a379fcec020a605deec6cb9d7e3b588)
- sec out.jpeg (72.45 KiB) Viewed 1022 times
The second picture is taken from above showing the lead which connects the secondary coil to the laminated metal core into which will be induced the HT when the primary and secondary coil's energy source is switched off.
![lam.jpeg](./download/file.php?id=104561&sid=6a379fcec020a605deec6cb9d7e3b588)
- lam.jpeg (112.51 KiB) Viewed 1022 times
The picture above shows the laminated strips of metal which form the central core, into which passes the HT from the primary and secondary windings. This core is made up of multiple strips of metal. (contd.)