In Reply to: Re: broke 860 posted by bob Thomas on November 08, 2018 at 20:15:18:
The 12 volt round can coils will usually have printed right on the side, something like "NO EXTERNAL RESISTOR REQUIRED" or "USE WITH EXTERNAL RESISTOR". The only reason I can think of that anyone would use an external resistor would be so they can wire a bypass to get hotter sparks when cranking the engine. I don't think it's worth the added wiring and parts to fail. I might feel different if I had to deal with winter temps a lot colder than it gets in Virginia..