Generac Power Systems 5413, 5412 Starter Contactor Relay Starter Motor, 5. - Start-Stop Switch

Section 5

ENGINE DC CONTROL SYSTEM

a.With Wire 17 grounded, a Crank Relay on the circuit board energizes and battery voltage is delivered to the Starter Contactor Relay via Wire 56. The Starter Contactor Relay energizes, its contacts close and the Starter Contactor is energized via wire 16. Its con- tacts close and the engine cranks.

b.With Wire 17 grounded, a Run Relay on the circuit board energizes and battery voltage is delivered to the Wire 14 circuit. Battery voltage is delivered to the Fuel Pump, Fuel Solenoid, Choke Heater and the Remote Harness.

2.Wire 18 from the Printed Circuit Board. This Is the ENGINE STOP circuit. When the Start-Stop Switch is set to “STOP”, Wire 18 is connected to frame ground via Wire No. 0. Circuit board action then opens the circuit to Wire 14, and grounds Wire 18A. Fuel flow to the carburetor and igni- tion are terminated.

3.Wire 0 connects the Switch to frame ground.

712

712

JUMPER WIRE

18	8	7	0
	1	4

25

18

36

0

17	LED
	712	0
		18
	START 17	STOP
	PRIME
		SW1
	0	0
	0

Figure 5-5. – Start-Stop Switch

Starter Contactor Relay

& Starter Motor

The positive (+) battery cable attaches to the large lug on the starter contactor. Wire 13 then attach- es to one side of the starter contactor relay contact, from this point Wire 13 attaches to the fuse F1 to supply battery voltage to the DC control system. The opposite side of the starter contactor relay con- tact is connected to Wire 16.

Wire 16 will supply battery power to the starter contactor and to the Printed Circuit Board for field flash when the starter contactor relay is energized. Attached to the starter contactor relay coil is Wire 56 (positive supply during cranking) and Wire 0 (ground).

When the Start-Stop switch is set to “START”, the circuit board delivers battery voltage to the Starter Contactor Relay via Wire 56. The Starter Contactor Relay energizes, its contacts close and the Starter Contactor is energized via wire 16. Its contacts close and battery voltage is available to the starter motor, and the engine cranks.

Figure 5-6. – Starter Motor

1316

1316

COM NO

56 0 56 0

Figure 5-7. – Starter Contactor Relay

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