[meric42]

I would start by disconnecting the low tension wire from the coil to the distributor at the distributor and removing the HT lead from the distributor cap. Then, with the ignition on and holding the end of the HT lead near the block or head and touching the LT lead to the block a few times you will be able to check the operation of the coil i.e. you should see a good blue spark jumping from the HT lead to the block. Be careful not to get your hand too close to the end of the HT lead as it might bite you.