Ignition coil with or without external resistor?

[da.bees]

This has been discussed,debated and rediscussed more times than varmints eating on front porch and sleeping in the house without mention of what I'm about to say. For our purpose the subject is confined to 6 volt equipment converted to 12 volt. It goes without saying this doesn't work if it says "no resister required" on coil. I say when there's an option, go with external resister but go one step further in bypassing resister while cranking. Many oe starter solenoids have a post which supplies full battery volts to coil while cranking,if it's there,use it. Where there is no provision for bypass , a dedicated switch , push button or toggle with buzzer/light to prevent accidently leaving on can be activated while cranking. I've made this change a few times and engine invariably starts easier,most recently a neighbor's that was amazed how much quicker his old Jubilee started.

 

[Hobo,NC]

Here we go again

 

[sotxbill]

And... many 6 volt tractors already have a dropping resistor before the coil. (more fuel on the fire), Not to mention they have a special " ground activated" solenoid safety switch.

 

[used red MN]

Where there is no provision for bypass , a dedicated switch , push button or toggle with buzzer/light to prevent accidently leaving on can be activated while cranking. I've made this change a few times and engine invariably starts easier,most recently a neighbor's that was amazed how much quicker his old Jubilee started.

A wire from the starter feed post to the coil with a diode that is positioned so the voltage fed to the coil by the ignition switch cannot back feed attempting to energize the starter after cranking has stopped would do the same thing. There is no complicated switches, lights or buzzers required. If a diode is to complex for you electrical knowledge than use a momentary switch that is spring loaded requiring it to be held on the on position. Place it close enough to the ignition switch or start button so a free finger on that hand can push it. This leaves the other hand free to operate the choke or throttle as needed.