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Show Special Resistance Coil Used in Ignition System On practically all cars made today the Ignition system operates on the c osed circuit principle. This means that the contact points that are used to break the current in the primary circuit of the spark coil are closed ex-cept ex-cept during a very brief interval following fol-lowing the break which causes the spark. And as the primary circuit of the standard type of spark coil has a relatively low resistance, it is necessary neces-sary to put a special resistance coil In circuit with It to limit the flow of current cur-rent This special resistance coil Is ordinarily located on the spark coil as shown Jn the illustration. When your battery unexpectedly goes dead so dead that you cannot even start the car by hand cranking, you will find it possible to get the motor going by short-circuiting this RESISTANCE UNIT. I DlSTP.BUTOR .J How to Start a Car by a Short Circuit When a Battery Goes Dead. resistance and thus permitting the greatest possible flow of current through the coil. A start can always be made in thij way unless your battery bat-tery is absolutely dead so that there is not the slightest amount of current left in it a condition which is rare. The method of short-circuiting this resistance coil will depend on the construction con-struction of the particular type of coil in your car, but by a careful examination examina-tion you will be able to see how to connect a short piece of wire so that the current can get around the resistance. resist-ance. The short-circuiting wire should be removed as soon as the motor has been .started, because if it is left on for any length of time the extra current cur-rent may seriously damage the coil. Popular Science Magazine. |