Generac Power Systems 4451 & 4986 Repair Manual page 23

0
C1-12
0 44A
0
C.B.
30A
0
14
14
86
15
14
18
13
GOVERNOR
ACTUATOR
15
13
SCR
17
Wire 15 12 VDC fused battery supply voltage is supplied to the normally open contacts of the SSR. One set of
normally open contacts are connected to Wire 15B, the other set of normally open contacts are connected to Wire
14. The SSR is de-energized and no voltage is available through the contacts.
Wire 15 12 VDC fused battery supply voltage is supplied to the Battery Charge Rectifier number 2 (BCR2). This is
a return current path for battery charging. No current flows at this time.
Wire 18 connects to the ignition magnetos and to the normally closed contacts of the SSR. The normally closed
contacts are also connected to Wire 0, Wire 0 is frame ground.
The SSR is de-energized and the magnetos are grounded out at this time, no spark is available.
11B
11B
0
120/240V 120/240V
30A
50A
TWISTLOK
11A 0
22
C.B.
30A
C.B.
50A
11
22
0
44
C2-12
0 0
C2-7
14 14
FSS
C2-5
86 86
LOP
0
0
C2-2
15 15
C2-10
15 15
C2-4
167 167
SW1
C2-3
0 0
C2-8
0
17 17
C2-1
D2
18 18 IM1
SP1
D3
IM2
17
SP2
C2-6
13 13 RED
C2-11
SC
13 13
SC SM
C2-9
16
16 BLACK
22 22
120V/30A 120V/30A
TWISTLOK TWISTLOK
44B 0 11D 0
C.B. C.B.
30A 30A
11
22
0
44
LEGEND
BA - BRUSH ASSEMBLY
BCR1 - BATTERY CHARGE RECTIFIER, 10A
BCR2 - BATTERY CHARGE RECTIFIER
0
CB1 - 10AMP AUTO RESET BREAKER
CB2 - 5AMP AUTO RESET BREAKER
D1 - 600V 12A DIODE
0
D2, D3 - ENGINE SHUTDOWN DIODE
F1 - 10A FUSE
FSS - FUEL SHUT OFF SOLENOID
GND - GROUND BAR
I.C.T. - IDLE CONTROL TRANSFORMER
IM1 - IGNITION MODULE, CYL. 1
IM2 - IGNITION MODULE, CYL. 2
LOP - LOW OIL PRESSURE
R1 - 25 OHM, 25W RESISTOR
15
SC - STARTER CONTACTOR
SCR - STARTER CONTACTOR RELAY
SM - STARTER MOTOR
17
0
SP1 - SPARK PLUG, CYL. 1
SP2 - SPARK PLUG, CYL. 2
SSR - START / STOP RELAY
SW1 - START-RUN-STOP SWITCH
SW2 - IDLE CONTROL SWITCH
TB1, TB2 - TERMINAL BLOCK
BATTERY
12V
engine Dc contRol sYsteM
120V
DUPLEX
22
TEST
TEST
44D 22 0 11C 22
C.B.
20A
11
22
0
44
= 12 VDC SUPPLY
= 12 VDC CONTROL
= AC POWER
= GROUND
section 4
120V
GFCI
RESET
RESET
0 44C
C.B.
20A
Page 21