No Fire and dumb question

While trying to start my 75 this weekend I noticed it cranked a little faster than usual so I popped open the hood and checked for spark and there is none. What would be the most probable cause for this, ignitor? coil? something else. Now time for the dumb question, The toyota manual says to check ohms on the coil to troubleshoot for problems but it doesnt say if you should disconnect it first so, do you disconnect the wires or leave then on? Sorry , just wanna make sure.
thanks again

When i was younger everyone liked to be and disconnect all the jeeps center wire off the dist cap so it wouldnt start. If you have younger kids around your neighborhood it never hurts to look there. But seems like your smarter than that so...

You can test without disconnect. I assume you have basic electrical knowledge. You can get the coils to wind up with a faily small current and get zapped.. you've been warned.

With ignition *off* the ignition circuit will be open and you can test resistance across the coil (though to be thorough you should really disco it). Refer to FSM for proper values. Primary is usually 1-2 ohm (read across primary studs), secondary is usually 5-20Kohm (read across primary minus stud to coil lead). Check each primary stud to housing as well (should read infinate i.e. open).

After doing this, check chassis ground to coil as well as supply voltage to chassis ground after ignition is on (be careful).

Ignition lead might be bad as well.

You should find a fault somewhere along the way. Google for ignition system problems and you should turn up countless resources. Remember, this isn't rocket science .