IFFFFFFFFFFF you have the CORRECT Ignition switch that's wired CORRECT THERE SHOULD BE NO FIRE ON THE POINTS WHEN CRANKING WITH IGNITION OFF AND IF SO READ BELOW !!!!!!!!!!!!
(Copy and paste of my response above)
With all due respect to James and Lee, let me offer a somewhat different response, maybe right maybe wrong, its based on olddddddddddd recall lol so NO WARRANTY. I believe there's a safety related reason for FOUR wires to the coil NOT just 2 or three, and if wired correct to the correct ignition switch IT SHOULD NOT FIRE WHEN CRANKING WITH IGNITION OFF IE
ITS NOTTTTTTTTTTTTTTTT NORMAL AND DOES (or should be for safety and originality) NEED FIXED !!!!!!!!!!!!!!!
IFFFFFFFFFFF its wired CORRECT with the CORRECT ignition switch ……………………..
a) With Ignition ON when cranking the ballast is by passed so there's unballasted battery voltage getting to the coil via the extra little terminal on the starter switch so the points would spark and the coil produce a spark........Thats the ballast by pass while cranking system used with a 6 volt coil on a 12 volt tractor to produce a hotter spark when cranking to help in cold weather starting.
b) With Ignition OFF when cranking if its wired CORRECT with a CORRECT ignition switch THE POINTS SHOULD NOTTTTTTTTTTTT SPARK That's a safety design so if a person engaged the starter with the ignition OFF it wouldn't spark when cranking
HERES HOW IT WORKS AND WAS DESIGNED AS I BEST RECALL
I believe there are FOUR wires TO the coil (even if one is from ballast where it wires to coils input).
1) On INPUT from ignition switch one wire is hot when ignition is ON 2) On INPUT (or ballast terminal that wires to coil) there's a wire to the small side terminal on the starter switch which is hot ONLY while cranking to by pass the ballast while cranking. 3) On the coils OUTPUT there's a wire to the distributor which leads to the points inside. 4) On the coils OUTPUT theres s wire up to the MAG/GROUND terminal on a CORRECT ignition switch so if its cranked with ignition OFF the coils output is safety grounded (effectively shunts across points) so there's no fire and the points should NOT spark.
Thats the reason for FOUR wires on the coil, 2 on INPUT (or one to ballast which wires to coil) and 2 on OUTPUT. Normally the OUTPUT just has one wire to the points but for safety to prevent fire when cranking with ignition OFF you need the extra safety wire to a CORRECT ignition switch which grounds the points (direct path from coil output to ground) when cranking if ignition is OFF
MY BEST GUESS FOR WHY POINTS STILL FIRE WHEN CRANKING WITH IGNITION OFF
A) Wrong ignition swtitch with no MAG/GROUND terminal down to the coils OUTPUT...….. B) Wire is missing or disconnected FROM coils OUTPUT TO MAG/GROUND terminal on ignition switch. C) Ignition switch is bad or not well frame grounded..... D) Incorrect Ignition switch missing the Mag/Ground terminal I believe the correct switch had the Mag/Ground terminal which grounded out a mag if a mag was used instead of a distributor and the ballast and ballast by pass.....
TROUBLESHOOTING Insure you have the correct ignition switch,,,,,,,,,,,,,, with the extra Mag/Ground terminal that's connected to the coils output,,,,,,,,,,,Insure the coil has two wires on its OUTPUT