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دى طريقة توصيل مقاومه على التوالى بين البوبينا ومفتاح الكونتاكت لمحرك 6 سلندر ( بنزين )

The Mechanical Ignition System


(from the dawn of the automobile to 1974)


http://www.familycar.com/classroom/I...ionDiagram.gif


The ignition switch.


There are two separate circuits that go from the ignition switch to the coil. One circuit runs through a resistor in order to step down the voltage about 15% in order to protect the points from premature wear. The other circuit sends full battery voltage to the coil. The only time this circuit is used is during cranking. Since the starter draws a considerable amount of current to crank the engine, additional voltage is needed to power the coil. So when the key is turned to the spring-loaded start position, full battery voltage is used. As soon as the engine is running, the driver releases the key to the run position which directs current through the primary resistor to the coil.


On some vehicles, the primary resistor is mounted on the firewall and is easy to replace if it fails. On other vehicles, most notably vehicles manufactured by GM, the primary resistor is a special resistor wire and is bundled in the wiring harness with other wires, making it more difficult to replace, but also more durable.

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المهندس : محمد قاسم MAKA