Ignition With Ballast Resistor Wiring Diagram

Some brands utilized a resistor in the coil or a resistor wire hidden in the wiring from the ignition switch but mopar put their resistor or ballast resistor on the firewall or inner fender.

Ignition with ballast resistor wiring diagram. Set the ballast resistor up to the firewall and screw the clamps in place. From the other terminal on the resistor a wire goes to the positive on the coil. Resistor wire for models. The typical automotive ignition system prior to 1974 consisted of a coil and ballast resistor with breaker points to interrupt the current flow when a spark was needed.

We ll check on this. The following diagram shows the 5 pin box with dual ballast resistor. Connect ohmmeter between purple red wire at coil and purple wire at alternator. Strip the end of the positive wire from the ignition and connect it to the positive end of the resistor.

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Start is only hot 12v dc during cranking and run is hot 12v dc from the moment you turn the key on through crank and after crank. Disconnect purple lead at back of alternator. In the years when engines were a lot easier to work with a ballast resistor was used in order to prolong the life of the coil. The purpose of an ignition ballast resistor between the ignition switch 12v and the ignition coil positive terminal is to restrict current flow.

Connect wires to positive. The job of the ballast resistor was to inhibit current to a level that would not overheat the coil. This simple system is easy for even the novice mechanic to wire. As a matter of fact a bad diode trio in a conventional alternator can do the same damage.

All special tools required. Ohmmeter test procedure resistor wire disconnect 20 gauge purple red resistor wire from ignition coil positive terminal.