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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.
SW1
START
PRIME
STOP
18
17
0
LED
0712
0
0
8
1
2
3
7
4
5
6
712
712
18
18
17
0
0
JUMPER WIRE
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
COM NO
1613
56 0
13
16
0
56
Figure 5-7. – Starter Contactor Relay
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