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The wire going to the + side of the coil is called the primary lead wire. It needs to be switched ON when the engine is running and OFF when the engine is shut down. This task is normally performed with the ignition switch. A wire runs from a position on the ignition switch that is powered when the switch is ON.
If your rig has been converted to 12 volts, there needs to be some type of resistance in the powered wire to coil +. This takes the form of a ceramic resistor called a ballast resistor, or on more modern rigs, a special wire with built in resistance.
If you run 12 volts and don't want to deal with some type of resistance deal you can install a ignition coil that has the resistance built in. If you power your coil from the battery without a switch for long periods of time, you can cook the points and ruin the coil...as you noticed with the heat.
Does this make sense to you?
Stuart | | |
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