Could you post the model of your generator ? The information is for a Model BGE Onan built around 1984-86 time period.
So ignition information should be close.
The FMCA web page is going through some updating starting tomorrow, for about 10 days.This may cause some problems accessing the forum.
Hope the fallowing information helps you get it running.
Note, the relays used in these units where sealed and filled with Nitrogen to extend life of the relays
Ignition system wiring includes: (1) One positive (B+)
wire which carries the low voltage current from the
battery to the primary winding of the coil. (2) One
negative (-) wire which carries low voltage to the
points and condenser. (3) Two high tension wires
that carry the high voltage current from the secondary
winding of the coil to the spark plugs. The spark
plugs and coil secondary are all.grounded to the
engine making a complete circuit for the voltage back
to the battery. The ignition coil primary (low voltage
side) is grounded when the breaker points close.
Check all low voltage wiring for loose connections
and cuts or breaks in the insulation. Clean all terminals
and connections and test for continuity with an
ohmmeter. Use a megger to check for breaks in the
spark plug wire insulation.
Printed Circuit Board Assembly
The printed circuit board assembly is the center of
the generator set control system. The PC board circuitry
controls the start, starter disconnection, stop,
and battery charging functions. The primary components
of the PC board include three relays, one power
rectifier, two diodes, one capacitor, five resistors, and
a 5-ampere fuse. The only serviceable
component is the fuse which is removable from the
front of the control panel. connections to the PC
board are made through an eight pin connector (Pl).
mounted on the board and through the six lead wiring
harness. The PC board assembly mounts on the back
of the control panel.
Placing the Start/Run/Stop switch in the Start position
connects battery ground (B-) to the K4 start
relay. This energizes the K4 relay which closes two
sets of contacts (K4-2,8 and K4-9,15) that connect
battery positive (B+) to the generator field windings
through (CR4 +), T1 Ignition coil, E3 fuel pump, and
K1 start solenoid. Connecting B+ as deschbed produces
the following control responses:
Flashes the field to ensure there is adequate residual
magnetism to induce voltage buildup.
0 Energizes the ignition coil (Tl) so it can begin producing
an ignition spark when the breaker points
begin to open and close.
0 Energizes the fuel pump (E3) which begins pumping
fuel to the carburetor.
0 Energizes the K1 start solenoid to close the K1
Closing the K1 start solenoid contacts connects B+ to
the starter motor. This energizes the starter motor
which begins to crank the engine to initiate starting.
When the engine starts, the low oil pressure switch
(S2) closes to connect battery ground (B-) to the K3
run relay. As the engine comes up to speed, AC output
voltage from the generator is supplied to the choke
heater element (HI) and to the K2generator relay.This
activates the heating element (which opens the choke)
and also energizes the K2 relay. Energizing the K2
relay closes one set of contacts (K2-25) that connect
B+ to the K2 run relay. This energizes the K3 relay
which opens two sets of contacts to produce the following
Closing the K3-9,15 contacts (which parallel the
K4-2,8 contacts) provides an alternate pathway for
supplying B+ to the T1 ignition coil and E3 fuel
Opening the K3-1,8 contacts disconnects B+ (CR4
positive terminal) from the generator field windings.
Closing the K3-2,8 contacts connects B+ to the run
light, time meter, and battery condition meter.
Opening the K3-9,16 contacts disconnects B+from
the K4 start relay causing it to DE-energize.
De-energizing the K4 relay opens the K4-2,8 and K4-
9,15 relay contacts. Opening the K4-2,8 contacts has
no effect since they are in parallel with the closed
K3-9,15 contacts which connect B+ to the ignition
coil and the fuel pump. Opening the K4-9,15 contacts
disconnects 6+ from the K1 start solenoid. De energizing
the K1 start solenoid disconnects B+ from
the starter motor which stops cranking.
When the S1 switch is placed in the RUN position, the
engine continues to run. Relays K2 (generator relay)
and K3 (run relay) are energized while relays K1 (start
solenoid) and K4 (start relay) are De-energized.
Generator voltage is rectified to DC by the CR-l power
rectifiers and supplied to the battery through the
charge resistor (R6). This charges the battery at a
constant rate (1 ampere maximum) during set