SWITCH AS-MULTIFUNCTION 3399364 - Caterpillar

G399 - 49CIntroduction
The 7C0753 Magneto is a service replacement for the two 2W3743 Magnetos originally used on the above engines. Some changes to the engine are necessary before installation of the single magneto. See the part lists for the parts necessary to install the 7C0753 Magneto on engines with shielded or nonshielded ignition systems.Reference: Service ManualParts List
Installation of 7C0753 Magneto
1. Turn the engine flywheel to position the crankshaft at No. 1 position TDC. Remove the two original magnetos from the engine: see the Service Manual.2. Remove the wire harness from the magnetos to the transformers on engines with nonshielded ignition systems. Remove the wiring harness from the magnetos to the junction box on engines with shielded ignition systems. 3. Put 6L5270 Gasket (1) in position; then use the former bolts, washers and nuts to install 7C0753 Magneto (2).4. Connect one end of 1V1151 Wire Assembly (3) to rear cover bolt (4) on magneto (2). Put the other end of wire assembly (3) under the head of bolt (5) on the engine side cover.5. Put 6D0047 Nut (6) with a 5B7376 Washer on 1M0644 Bolt (7). Use two 6L5270 Gaskets (8) and the original bolts, washers and nuts to install 8L9755 Cover (9).6. Put bolt (7) through the center hole in cover (9), and tighten it into magneto drive shaft (10). Hold bolt (7) to prevent turning: then tighten nut (6) against cover (9) until gear (11) is pulled away from the main magneto drive gear.7. For engines equipped with nonshielded ignition systems only, a new 7C4368 Harness Assembly is required along with the remainder of the parts from the nonshielded ignition parts list. Use the appropriate wiring diagram to wire the ignition system.Wiring Diagram for Engines Equipped with Nonshielded Ignition System (CCW Rotation)
Wiring Diagram for Engines Equipped with Nonshielded Ignition (CW Rotation)
Wiring Diagram for Engines Equipped with Shielded Ignition
8. For engines equipped with shielded ignition systems only, a new 7C4462 Wiring Harness is required along with remaining parts from the shielded ignition parts list. Use the wiring diagram shown above to wire the ignition system.