Some cars have, instead, a special high-resistance wire between the ignition switch and the coil to reduce the voltage. Some old cars have a resistive lead from ignition switch to coil instead of a separate resistor. Any significant difference from the factory specs would indicate that the ballast resistor is defective. With the wires disconnected, check the resistance between the two terminals of the ballast resistor. Use an electrical multi-meter to test ballast resistor function. In the event that the ignition is left in the run position, and the points happen to be open, electrical arcs can cause raised spots on the points resulting in a change in dwell timing or an engine that won't run at all. Once the engine has started, the coil is fed in the usual way from the ignition switch.
57 THUNDERBIRD IGNITION COIL ADVANCE FULL
When the ignition key is in the start position, full current is applied to the coil and increases voltage to the spark plugs. There are two leads from the ignition switch to the coil one for normal running going through the resistor the other for starting, which bypasses the resistor to provide extra ignition strength. Make sure it is not cracked, and that the connectors are tight. The ceramic resistor is sometimes clamped to one of the coil mounting bolts. Too high an amperage can damage the surface of the points and cause failure. The ignition ballast resistor extends the life of the coil and the points. If your Ignition coil has the recommended primary resistance, remove or bypass all external resistors. Do not remove resistors if the coil primary resistance is less than specified.ĥ. Four and six cylinder engines require a minimum of 3.0 ohms of primary resistance and eight cylinder engines require a minimum of 1.5 ohms of primary resistance. See Chart on back page for coil recommendations.Ĥ. (This is the base unit, I believe the better ones do not do this.)ģ. Leaving the ignition “ON” with the engine “OFF” for an extended period could result in permanent damage to the Ignitor. The Ignitor is designed for 12-Volt negative ground systems.Ģ. I am the last to give out electrical advice lol - see smoke show in my other posts - but.ġ. The main reason for the wire was to help the points last longer from my understanding.
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