1942 - 1947 Chevrolet Shop Manual



	12-28


	Fig. 58-Polarity Reversing Switch an Starting Motor The diagrams. Fig. 59, show the connections and operation of the switch. These two diagrams show the two directions of current flow through the primary circuit, one or the other is always in operation. The purpose of this arrangement is to produce uniform wear on both distributor contact points, thereby increasing point life.
		Fig. 60-Reversing Switch Parts All parts of the reversing switch are serviced. Figure 60 is a layout of all parts comprising the complete switch unit. Always be sure the battery positive cable is attached to the starter switch so that the cable leads straight up from the rear of the terminal (in such a manner that it will not obstruct the starter shift lever when starting the engine), to prevent any possibility of the cable interfering with the reversing switch operating linkage. Checking Switch Operation Proper operation of the reversing switch is essential to the flow of primary current through the ignition system. If for any reason current fails to flow through the switch, the ignition system will fail to function. Should there be any question about the proper functioning of the switch, it should be checked as follows: 1. With the breaker points closed, turn on ignition switch. If primary circuit is closed, the instrument panel ammeter will indicate the ignition load. 2. Slowly push down on the starter pedal while watching the ammeter. As the pedal is partially depressed and the reversing switch begins to operate, the ammeter hand will return to zero. 3. Continuing to depress the starter pedal should again complete the primary circuit through the reversing switch and cause the ammeter to register as in paragraph 1 above. 4. Additional movement downward on the starter pedal will cause the reversing switch to "click," the ratchet locking into the closed circuit position. Further movement of the pedal beyond this point will be absorbed by the over-travel spring and should have no effect on the reversing switch.

	Fig. 59-Reversing Switch Circuits
	The switch has a positive stop for the forward movement or travel of the switch lever, insuring proper travel of the lever when the starter lever is depressed to start the engine. The operating linkage consists of a connector lever, from the starter shift lever to the switch lever, made of a flat stamping with a spring loaded sliding section to prevent any possibility of bending when the switch lever contacts the stop. The reversing switch must always be assembled to the starting motor with the switch lever down as shown in Fig. 58.