WIRING DIAGRAM SCHEMATIC
DELUXE
STANDARD
AZ. REMOTE CONTROL REF! A} REMOTE CONTROL (REF!
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REF. DES. QTY. DESCRIPTION
Ai 1 Control Assy
Az 1 Deluxe Remote Control (Ref)
Ad 1 Standard Remote Cont (Ref)
BT! 1 Battery 12
Ci 1 Capacitor
CA! 1 Diode Assy (Ref)
El 1 Choke = Onan
EPA 2 Spark Plug
Ed 1 Solencid-Fuel (Ref)
ES 1 Fuel- Pump (Ref)
F1,2 2 Fuse (9 Amp, 32 Y) (Rel)
G1 1 Generator
K1 1 Solenoid - Start
Ri 1 Resistor Fixed (Ref)
51 1 Swlteh-Start-Stop
Se 1 Breaker & Cap Assy
53 1 Switch = Low Dil Press (Raf)
T 1 Сай - Ignition
Option 1 Wiring Harness (Conn-Remote)
(Ref)
Option wi 1 Wiring Harness (Cable-Remote
Control) (10 Foal Long) (Raf)
Option — wz 1 Wiring Harness (Cable-Remote]
Control {30 Feet Long} (Ref)
FIGURE 36. TYPICAL WIRING DIAGRAM - BF SPEC A
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REF, DES. QTY. DESCRIPTION Ki
A1 | Control Assy - 01 -05 к
1 Control Asay - (2
1 Control Assy - 05 RI
1 Control Assy - 0d
AZ 1 Céfixe Hemaote Control S51
ña | Standard Remote Contral 52
BT 1 Battery 12 53
E Capacitar 54
CAT 1 Rectifler Tn
E 1 Choka = Oran
EZ ES 2 Spark Plug Uption W1
Ed | Fuel Pump Opran we
= | Solenoid - Fusl (When Used)
F12 2 Fuse (5 Amp, 32 М) Option 43
Gi 1 Generator
6ll-Il2 7
Salenowd - Start
Relay - Мрт
Resistor - Fixed (BF)
Resistor - Fixed (NH & ССК)
Switch - Start-Siop
Breaker & Cap Assy
Switch - Low Cil Press
Swlich - High-Air Temp
Coil = Ignition
Wiring Harness (Conn - Remote)
Wining Harness (Gable - Ramate)
Contra (30 Feet Long]
Wiring Hameass [Cable - Rernôte)
Control 30 Fest Long]
FIGURE 37. TYPICAL WIRING DIAGRAM - BF SPEC B AND NH SPEC J LMC
34
OPERATION DESCRIPTION FOR
BFA, BGA, AND NH (SPEC K-p) MC
This operation description applies to BFA, BGA, and
NH (Spec K-P) series generator sets. The wiring
diagrams are included as examples to help trace or
Isolate problems. However, always refer to the wiring
diagram that corresponds to the model and spec
number of the generator set when troubleshooting.
Starting
When switch 51 is closed to START (Figure 38), battery
ground is connected through switch S1 to the start
solenoid K1 and the crank ignition relay K2. Start
solenoid relay K1 closes its normally open K1 contacts
to connect battery positive to the cranking windings of
the generator and to choke El. The generator acts as a
motor and cranks the engine. Ignition relay K2 closes
its normally open K2 contacts to connect battery
positive to the ignition coil T1, and fuel pump E4. This
provides the ignition spark and pumps fuel to the
carburetor,
Start Disconnect-Run
When the engine starts, oil pressure closes switch 53
which connects battery ground to the K3 run ignition
relay. Generator voltage energizes the K3 relay which
has two sets of contacts, one set normally open and
the other set normaly closed. The normally open set
of K3 contacts close to connect battery positive to the
ignition coil and fuel pump. The normally closed K3
contacts open to disconnect battery positive from the
K1 start solenoid.
De-energizing the K1 start solenoid opens the K1
contacts to disconnect battery positive from the
cranking windings of the generator. The operator
releases the start-stop switch which de-energizes the
K2 crank ignition relay and opens the K2 contacts.
The engine continues to run because battery positive
is supplied to the fuel pump and ignition coil through
the closed K3 contacts. Generator voltage is supplied
to the electric choke heater E1 to open the choke.
Generator voltage is also supplied through diode
CR1 to charge the battery.
Stopping
Moving start-stop switch 51 to STOP grounds the K3
ignition relay causing it to de-energize and open the K3
contacts. Opening the K3 contacts disconnects battery
positive from the ignition coil and fuel pump. When the
engine stops, blocking diode CR1 prevenis battery
discharge through the generator.
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Falda sas Deluxe Remote Control
ari -. Battery
EPs mensa ona Electric Chokes
ERED suena Spark Plug
Ed......c.cv...Fusl Pumg
BY eeu sie Generator
K1 _..... Start Solanold Relay
KZ _...........Crank Ignition Ratay
ME ia Run Ignition Relay
RARE cessera Hasrstor
RAN atm pr HACK Start-Stop Switch
> CEE Breaker Points
Sessa DA Di Pressure Switch
1 aan Ignition Coil
CB1,CB2 ......Circuil Breakers
FIGURE 38. TYFICAL SCHEMATIC AND PARTS IDENTIFICATION
TROUBLESHOOTING THE BFA,
BGA, AND NH (SPEC K-P) CONTROL
To correct a problem, answer the question in the
appropriate troubleshooting chart on the following
pages either YES or NO. Refer to the number in that
column and proceed to that step.
Use the wiring diagram (see Figure 40) for location of
terminals, relays, elc. Figure 39 shows some of the
control components for the generator sets.
TERMINAL BLOCK,
TES (WHEN LISED) —|
CEL PRESSURE SWITCH
LEAD —
WIRE CONNECTOR
REVERSE CURRENT | X
DIODE CRY `
CRANK IGNITION
RELAY K2
NOTE: CONTROL PANEL
SHOWN ROTATED DOWN 90°
TO ENABLE ILLUSTRATION
OF CONTROL COMPONENTS.
The troubleshooting chart is divided into seven sec-
lions. Determine the problem and then refer tothe char
(А, В, С, В, Е, ВБ, or G) for the troubleshooting
procedures.
À.
B.
С.
D.
=
F.
G
Engine does not crank.
Engine cranks but does not start.
Engine starts but stops when start switch is released.
Generator set is running — then stops.
Low battery — no charge rate.
Running Time Meter Inoperative.
. Battery Condition Meter Inoperative.
REMOTE
CONNECTOR PLUG
04 40
051000
Dé 10
ES 1376
FIGURE 39. BGA, BFA, AND NH (SPEC K-P) CONTROL | / M
36
A. | ENGINE DOES NOT CRANK YES | NO
1 Does engine crank at set but not at remote start panel? 2 4
2. Check remote start control wires for continuity betwean the generator set
and the remote start panel. Are control wires sized large enough to avoid
excessive voltage drop? 4 3
4, Replace control wires with correct wire gauge. — —
4, Check condition of battery and terminal connections. Is battery fully
charged and are all terminal connections clean and tight? 6 5
6; Recharge battery and clean and tighten all terminal connections. = —
6. Is battery voltage present between remote connector plug terminals 3 and
5 (between terminals TB1-3 and TB1-5 where applicable) when switch 51
is pushed to START? When the remote start switch is pushed to START?
(Make certain fuse F1 is not open.) 8 7
re Replace start-stop switch S1 or remote start switch as required. — —
В. Is battery voltage present between ground and K3 relay terminal 874? 12 9
9, Is fuse F2 open? 11 10
10. Replace run ignition relay K3. {Contacts 87A-30 not closed.) — —
11. Replace fuse F2, rm =
12. ls battery voltage present between K1 start solenoid terminal St and
| ground when start-stop switch 51 is pushed to START? 14 13
13. Replace K1 start solenoid. — =
14, Check generator brushes, commutator, DC armature windings, and DC
field windings. See Generator Service Procedures section. — —
B. | ENGINE CRANKS BUT DOES NOT START _ YES NO
E ls battery voltage present between remote connector plug terminal 6 and
ground when start-stop switch is pushed to START? 3 2
2. Check all terminal connections on K2 crank ignition relay. If OK, replace
K2 relay, — —
3. Does the fuel pump operate during cranking? 6 4
4, Check the fuel pump lead wire connections and repair or replace as
necessary. Will pump operate? — 5
Refer to the Fuel System section for testing and service procedures. — —
6. ls the choke closed? A small pointer on the choke shaft indicates if the
choke is open or closed. 7 5
7. | Refer to the Ignition System section for testing and service procedures. — —
37
ENGINE STARTS BUT STOPS WHEN START SWITCH IS RELEASED
10.
11.
Does engine have correct oil level?
Add oil as required,
If oil level is OK, disconnect the low oil pressure switch lead wire. An
insulated connector is spliced into this wire and is located within the
control, After disconnecting the oil switch lead wire, ground the end that is
connected to the control. Push the start-stop switch to START, Does the
engine start and run?
To prevent engine damage from low
oil pressure, make sure the engine
builds up oli pressure to 30 ps! (207 kPa) after starting.
See Lubrication System section.
Check low oil pressure switch operation. Switch should close when oil pressure
builds up and open when oil pressure drops. Replace if necessary,
Check low oil pressure lead wire for an open circuit and repair or replace as
necessary. Reconnect oil pressure lead wire and push start-stop switch to
START. Does engine start and run?
Check wire connections between R1 resistor and K3 run ignition relay and
between R1 resistor and K1 start solenoid. Check resistance of R1 resistor (see
Parts Catalog for resistance value). Is R1 OK?
Replace R1 resistor.
Connect a jumper wire between remote connector plug terminals 5 and 6 (or
TB1-5 and TB1-6 where applicable) and push start-stop switch S1 to START.
(Make certain fuse F1 is not open.) Does engine start and run?
Connect a voltmeter between remote connector plug terminal 6 and ground (or
between TB1-6 and ground where applicable) and push start-stop switch 51 to
START. Does voltmeter read 12 volts?
Replace K3 run relay,
Check generator brushes, commutator, DC armature, and field windings. Refer
to Generator Service Procedures section.
10
11
11
ENGINE IS RUNNING - THEN STOPS
| YES
NO
Check the set for low fuel level or low oil level and refill as necessary. Will set
start and run without stopping?
Check for low oil pressure or low oil pressure switch malfunction. See sections
C3, C4, and C5 for troubleshooting procedures. Does this locate problem?
Connect a voltmeter between remote connector plug terminal 6 and ground (or
TB1-6 and ground if applicable) and push start-stop switch S1 to START. Is
battery voltage present?
Is fuse F2 open?
Heplace fuse F2.
38
Replace defective zener diode,
Replace defective battery condition meter.
ENGINE IS RUNNING - THEN STOPS (Continued) | YES | NO
Check for an open R1 resistor, an open connection between K3 run
ignition relay and R1 resistor, or defective K3 run ignition relay. See
sections C6 through C11 for troubleshooting procedures. — =
— LOW BATTERY | _YES NO
Does battery charger show a normal charge rate of 1 to 1-1/2 amps? 2 3
Check condition of battery. Generator set charger will not recharge a
battery that is in a very low state of charge, Use a separate battery charger
to bring battery up to full charge. == —
Check wire connection between CR1 diode, K1 start solenoid, R2 resistor,
and battery. Does this cause battery charger to show normal charge rate? — 4
Is CR1 diode shorted or open? 5 6
Replace defective CR1 diode. at =
Replace R2 resistor. pe
RUNNING TIME METER INOPERATIVE YES NO
Check wires between control terminal 6 and battery positive terminal for
running time meter, and ground wire and connection to meter. Does this
correct problem? i 9
Replace defective running time meter. — —
BATTERY CONDITION METER INOPERATIVE YES NO _
Is fuse F1 open? 2 3
Replace fuse F1. — —
Check wire connections between remote connector plug terminal 5 (or
TB1-5 where applicable) and the battery condition meter and between the
battery condition meter and ground. Does this correct the problem? —- 4
Use voltmeter to measure voltage between battery charge meter positive
terminal and ground. Does voltmeter read battery voltage minus 10 volts? 6 5
39
WIRING DIAGRAM
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5.0964. 675 NH AA 6-46
RECONNECTIÓN CHART
EA yA 6 ROW, ZW 120/240, 3w ROM ZW
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Те нана Wa | ro TERY Me E
А Control Assy (01) 30 Amp- A1 Reuisgtor - 150 ohm SW
Control Assy (-02} (1) 20 & (1) 40 Amp Hz Resistor
Control Assy (03) (21 50 Amp J1 Socket Plug - Remote
Control Asay (04) 30 Amp
Control Assy -06) {2) 30 Amp 51 Switch - Start Stop
АЗ Deluxe Aemote-Control 52 Switch - Breaker & Cap Assy
A3 Standard Remote Control 53 Switch - Low Oil Pressure
BT Battery = 12 \/ T1 Coil = Ignition
сл Capacitor
CA Rectifier (Ban, Charging) THE Terminal Board
Silksoreens
El Choke - Onan (Not Used wWLPG}
E23 Spark - Plug CH1.CB2 Circult Breaker 30 Amp
Ed Fuel Pump or ShutéfM/Filter - LPG ca Circult Breaker 30 Amp (1-02)
F1,2 Fuse Hésder wi wiring Harness Coon Remote
Fuse «5 Amp 32 V wz Wiring Harness - Cable Remote
a Generator Control 110 Feet Long
Ki Start Solenold МЗ Wiring Harenss - Cebés Remote
Ка Relay - Crank-gnition Control - 130 Feet Long
Ha Нем = Аш Мате Wid Lead Assy {Shutatf/Fltr Only]
FIGURE 40. TYPICAL WIRING DIAGRAM - BFA, BGA, AND NH (SPEC K-P)
40
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