Fig. 111.-Typical Wiring Diagrams Showing Splitdorf Transformer CoilMagneto Ignition Systems. secondary terminal. A high tension cable runs from the secondary terminal, which is protected by an insulating member to the central distributing terminal on the face of the distributor. The terminal marked "Bat." is attached to the carbon of a 5 dry-cell battery, while the zinc terminal of the series is connected with a terminal marked "Int." and "Bat." From this same terminal a wire runs to the terminal on the side of the contact breaker. The terminal on the face of the contact breaker is coupled to the coil terminal marked "Mag." A terminal on the coil marked "Grd." is attached to the grounding terminal on the magneto contact breaker. With this system, when the switch lever is pushed over to the side marked "Bat.," the current from the dry cell battery is conveyed to the magneto interrupter, from which it is led to the primary winding of the coil. The secondary current is distributed by means of the magneto distributor to the spark plugs in proper firing order. When the switch lever is shifted to the other side of the switch, which is marked "Mag.," the current for ignition is obtained from the magneto armature instead of the battery. Two of the Splitdorf ignition systems are shown at Fig. 111, that at A being used in connection with a round type dash coil, while that at B is employed with a square type dash coil. The coil at A has but six terminals, that at B has seven terminals. In the coil at A the center terminal is used for the high tension current and is connected to the central terminal of the magneto dis tributor. Terminal A of the coil runs to terminal A on the magneto contact breaker face. The wire marked "2" runs to the terminal on the side of the contact breaker. A wire joins terminal "3" on the coil with the grounding terminal "3" on the magneto. The two remaining terminals of the coil, which are below the secondary terminals, are joined to the battery, which is conventionalized for the sake of simplicity. In the system shown at Fig. 111, B, the terminals on the magneto and those on the coil are likewise numbered, and there should be no difficulty in tracing these and making the proper connections if this diagram is used as a guide. The Remy transformer coil system is shown at Fig. 112, the appearance and dimensions of the dash coil and the method of installation are clearly shown at A. It will be observed that at one end of the coil there are two terminals, one marked "Bat.," the other "R.," which are wired to the dry cell battery, as shown. On the back of the coil is the secondary terminal, clearly outlined at B, which runs to the center of the distributor. The magneto shown is intended for six cylinder ignition and therefore has six distribut ing terminals, to be connected with an equivalent number of spark plugs. In order to simplify the wiring when the Remy system is employed, the primary wire group, which consists of three wires, has the insulation of each conductor a different color. One is yellow, one green, and the remaining one red. The red wire, which is attached to the grounding terminal on the magneto base, goes to the center terminal on the side of the coil that has the three primary terminals and which is shown at B. This would be the right side if viewed from the front, while the battery terminals are on the left side, if the coil is looked at from the switch end. The yellow wire is connected to the contact screw on the breaker box and goes to the terminal on the side of the coil nearest the dash. The green wire runs from the screw on the magneto base to the remaining terminal on the coil. Dual Magneto Systems.-When the high tension magneto was first introduced it was looked upon in some quarters by conservative manufacturers and motorists with some degree of suspicion, as its reliability had not been thoroughly established. Sometimes difficulty was experienced in starting a large engine directly from the magneto because it could not be turned over fast enough with the hand crank to turn the magneto armature at sufficient speed to produce a strong spark. In order to provide an emergency system of ignition and one that could be used for starting, the mak ers of high tension magnetos evolved what are termed "dual systems." The magneto utilized is practically the same as that used in the simple high tension systems, except that the contact breaker had a battery timer added which was used to interrupt a battery current. The reason for adding the battery timer and not using the magneto contact breaker was that a short contact was necessary to obtain satisfactory operation from batteries, which the regular magneto contact breaker did not furnish. As the writer has previously explained, the points of a magneto contact breaker are kept in contact until interrupted by the cam. If these were used on a battery the current would be flowing through them all the time they were in contact, which would produce current waste. With the battery timer incorporated on the contact breaker the circuit is established only at the instant the spark is needed in the cylinder. |