I dont even know what I don't know let alone what I do know. Went and got an inline sparkplug tester. Went thru every sparkplug cable and it would light up as it passed that cable. It wasn't real bright so I go to test it with a multi meter. In my head I hook black to ground and alligator clip the red to each wire. But it doesn't register on a multimeter. Is that because it's not on that wire long enough? The old trying to get it to arc to a screwdriver doesn't show a spark. About ready to just hold one in my hand to see......ok, no spark while holding it. So now I don't understand whe the inline tester lit up.