The starter not turning has nothing to do with the ignition circuit (points, condenser, coil, resistor, etc.) Those components only supply spark to the spark plugs when the engine is turning.
The starter and starter solenoid, along with the the starter switch, and all of the wires that are interconnecting them are the only things involved in the starter motor spinning the engine. Oh yeah, and the battery.
So now let's get down to your description of the problem. This first part doesn't really tell us anything other than it won't start. It doesn't say anything about whether the starter motor is engaging the engine and turning it:
It wonít start now.
Iíve replaced most ignition parts: starter solenoid, ignition switch, resistor, points & condenser. Still to no avail!
All it does is click once, it doesnít even turnover. I have 12.6+ volts at battery, starter solenoid, key switch, & start button.
I am scratching my head a lot lately.
This next part gives us a clue that you hear a click and the starter doesn't even spin::
All it does is click once, it doesnít even turnover.
This next part sounds like the original key switch had a problem:
When I replaced the key switch it turned over but wouldnít start.
This next part indicates that you might have mis-wired something when you replaced the coil, or possibly installed an incorrect type of coil, since the starter was turning after the previous step:
I replaced the coil, now it just clicks again.
This next part has me puzzled:
I put the old coil back on. It wonít turnover any more.
Does it still click or doe is not even do that after putting the original coil back in?
The fact that you measure 12 .6 volts at the battery doesn't tell us anything about how much current the battery is able to supply, and it is the current that turns the starter motor. Have you measured the voltage at the battery when the starter switch is engaged (while it is trying to supply current)? If the voltage doesn't stay above 10 volts when the starter switch is engaged then the battery needs to be charged, and if it still drops below 10 volts when trying to start it after properly charging it then the battery needs to be replaced.
Sean in PA
1973 Ford 4000 3-cyl gas w/S-O-S & 60 inch Woods rotary mower
2008 John Deere X500
2015 John Deere X530
2014 Kubota BX25D w/50" snow blower
You know you might be a Nouveau Redneck if...
1. You use the cup holder on your tractor to hold your cosmopolitan instead of a beer
2. Your "Santa on a tractor" Christmas yard decoration is actually a high tech digital hologram.
3. Your deer camp cuisine is better than most 3 star restaurants.