Series 3 Coil connections

Having problems getting a spark. LT contact on coil is live but that is the only attached contact other than the HT lead. This is a picture from a Series 111 manual, what are the other 2 connectors in this picture doing and do I need them?

Power to positive on coil, negative connection goes to distributor. Without that nothing happens.
What's going on in your pic don't know, not enough info.

If that's a stock photo from a book then it could be a power feed to thel heater on a solex carburettor. It gets activated when you pull the choke on

tottot said:

Power to positive on coil, negative connection goes to distributor. Without that nothing happens.
What's going on in your pic don't know, not enough info.

Click to expand...

First picture was from a Series 3 manual, with 3 wires connected to the coil. This picture is my car with just one positive low tension connection and the other connectors vacant. Does it earth through the holding clamp or should it have a wire connection to negative on distributor?

No earth. Read my post above again.

If the coil was permanently earthed, ie through the body then it would never make a spark
Grounding the body can help reduce electrical noise from the coil and helps to sink heat away from the coil, maintaining efficiency

You should have two terminals on your coil. One will be marked + or sw and the other will be marked - or cb, Connect the + terminal to the wire from the ignition switch and connect the - terminal to the small lead on your distributor. If you have an electronic distributor you will have two leads, one red one and one black one. Connect the red lead to the + terminal on the coil with the ignition lead and the black one to the - terminal on the coil.