chrome ignition box: high voltage at the outside?
long term damage may occur from running with a pulled spark plug cable. Normal spark action clamps the voltage, with the open spark cable,
THIS is an EXTREMELY important point with any/ all modern electronic ignitions
To put this into "earthly words," LOL, here is what happens
Guys sometimes talk of "pulling plug wires" to see if a cylinder is dead
NEVER do that. Instead, ALWAYS GROUND that position. I usually either put small brads down beside the wires in the cap, or use a grounded probe at the cap while pulling a wire out with fuse pullers. Loosen the wires before hand
Spark voltage is just like lightning. It is seeking the "shortest path to ground." In and operating engine, this "shortest path" is always through the relatively small plug gap, which is EFFECTIVELY smaller (lower resistance) because of conditions inside the cylinder
This is what Dave means, above, when he says
"Normal spark action clamps the voltage"
The normally hooked up cap, rotor, wires, and plugs (going to ground) LOWER (load) the coil voltage to the normal "firing" voltage of the plugs
When you pull a plug wire, the coil voltage now suddenly has no place to go, the coil voltage goes to peak open voltage.
THIS very very high, abnormal voltage "reflects" this pulse backwards through the coil, and a high voltage pulse now appears "back" in the primary ---in the electronics switching
This can cause very bad and terminal failures to electronic ignitions, and INCLUDING the coil itself.