1) "So if I have no power to the coil, that is not an issue of the battery not being charged enough, correct?
NOT CORRECT you can still have what you call "power" to the coil HOWEVER if the battery is severely undercharged ORRRRRRRRR the battery or ground cables are bad ORRRRRRRRR the ignition switch or its wiring is bad such that if the voltage on the coil drops below say 9 or so volts on a 12 volt system or 4.5 or so on a 6 volt system THE LOW VOLTAGE CAN CAUSE A WEAK SPARK
You need to put a voltmeter on the coils input (NOT to distributor) terminal and measure it with ignition on BOTH when setting then during cranking. It needs to be near same as battery voltage when setting and then not drop too much when cranking. If it drops excessive when cranking the problem is
A) Battery is low B) Starter motor is bad C) Battery or ground cables are bad/loose/resistive D) Ignition switch is bad or theres a bad connection to or from Ignition switch to the coil
YOU HAVE TO READ THE VOLTAGE ON THE COIL WHEN SETTING AND CRANKING TO FIND THE PROBLEM NOT GUESS
2) If the battery is only half charged, the coil will still get some power, just not enough.
THATS POSSIBLE
ACTION ITEMS THEN REPORT BACK
Have the battery load tested for free at about any auto or battery shop Insure the battery is full charged Make sure battery cables and ground cables are all good Test the voltage on the coils input BOTH when setting with ign on and when cranking
Were trying to help but we need voltage readings to help more NOT guesses
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