Ignition Resistor Value

When discussing automotive electrical circuits the word ballast refers to a means to step down the voltage to a prescribed value. Just to get a little annal here the resistance of the copper coil wire primary or seconday will increase with increasing temperature.

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The resistance value of the ballast resistor is calibrated to deliver the 7v or so expected by the coils at idle.

Ignition resistor value. It could be thought of in simple terms as a resistor in a circuit. If the current drop matches the pre set value stored in memory. Also r educes burning and pitting of contact breaker points.

In addition to the standard side bar ignition there is a resistor embedded into the key. Point distributors required a two terminal resistor with 12 ohms of resistance whereas electronic ignition distributors used a four terminal resistor with the 12 ohms primary and a secondary circuit of 5 ohms resistance. My 52 chevy 3100 is still a 6volt system it came with a ceramic ignition ballastresistor.

One wire from the ignition on one tang one wire from the positive side of the coil on the other tang and i guess the other wire is a ground to the engine block. 14 ohm ballast resistor ideal for use with electronic ignition and high voltage charging systems. When the key is inserted into the lock and turned an electrical current runs through the resistor.

The factor is about 163 per degree f. 14 ohm heavy duty external ceramic ballast resistor installed between coils terminal and condenser or hotspark ignitions red wire. The amount of current drop caused by the resistor is measured by a computer.

During starting the ballast is by passed and the full available voltage is routed to the coils. On a point ignition system the resistor will reduce the incoming voltage to the coil from 14 volts when the charging system is active to about 9 volts.

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