Worst experience i have had with a coil was when a car came into the workshop for poor starting and rough running.
so imagine i have my head under the bonnet, my workmate sitting in the car,
he turns it over on the key, little attempt to start, that was about it, bit i did notice a little click coming fom the back of the enine bay
everytime he either turned on or off the ignition, no relays on this thing it was too old.
So leaning over the engine so i could see the coil, fair enough every time he turned the ignition on or off there was a darn good spark
comming from under the HT lead rubber boot which reached the side of the can.
so i shouted hang on a minute i gotta check something, and without thinking he turned the ignition off just as i grabbed said rubber boot
on the HT lead, resulting in one heck of kick, as i sprang back i hit my head on the bonnet, hard enough to lift the bonnet stay out of its pocket resulting in the bonnet dropping on both my arms as i retreated backwards, the darn bonnet scraped the skin down the back of both my forearms, There was a few choice words flying around the workshop, my mate was just rolling on the floor crying cos he was laughing so hard,
were still best of mates now,