Generac Power Systems 75 6.– Start-StopSwitch, Section ENGINE DC CONTROL SYSTEM, Starter Motor

Section 5

ENGINE DC CONTROL SYSTEM

age 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 contacts 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 Engine Controller 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. 0B. 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 0B connects the Switch to frame ground.

Wire 16 will supply battery power to the starter con- tactor and to the engine controller 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 cir- cuit 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 5-7. – Starter Motor

Figure 5-6. – Start-Stop Switch

STARTER CONTACTOR RELAY
& STARTER MOTOR
The positive (+) battery cable attaches to the large lug
on the STARTER CONTACTOR. Wire 13 then
attaches 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 con-
trol system. The opposite side of the starter contactor
relay contact is connected to Wire 16.	Figure 5-8. – Starter Contactor Relay

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