1. This product is designed to replace Onan part number 300-0679 in 12-volt systems.
2. This board is reset by turning off the RUN/STOP switch.
3. The keying slots in the circuit board allow it to be plugged into a 12-volt system only and also
prevent improper insertion into the connector. Take care to align the slots and then press the board
down until it is fully seated into the connector.
4. The adjustment range of the OVERCRANK alarm time delay is 20 to 75 seconds. Adjust the
OVERCRANK DELAY (R1) as needed, turning clockwise to increase the delay. The adjustment is
clearly marked.
5. The adjustment range of the LOW OIL PRESSURE alarm time delay is 8 to 30 seconds. Adjust the
LO OIL P. DELAY (R5) as needed, turning clockwise to increase the delay. The adjustment is clear-
ly marked. Keeping the delay as short as possible without false tripping will result in maximum
engine protection.
6. The IGN/FUEL output (pin 7) and the ALARM output (pin 8) are each rated at 5 Amps (relay rated
at 10 Amps) regardless of system voltage. Overloads on these circuits can cause damage to the relay
contacts and circuit board traces on original Onan boards. Severe damage to traces renders the cir-
cuit board non-repairable.
The Flight Systems product has a special fusible link that acts as a fuse in case of an overload. This
feature helps to prevent damage and allows the board to be repaired instead of discarded.
7. All sensor inputs have filters to improve noise immunity and help prevent false alarms.
8. Older Onan boards have tin-plated contact fingers on one side only. Later Onan boards have gold
plated contacts on both sides of the board which ensures a more reliable connection. The Flight
Systems product also has gold plated contacts on both sides.
(See reverse for Warranty & other details)
Technical Support:
717-590-7330 8-4:30 ET, M-F)
Fax: 717-590-7327
FLIGHT SYSTEMS
207 Hempt Rd, Mechanicsburg PA 17050
w w w . f l i g h t s y s t e m s . c o m
PRODUCT INFORMATION
Replacement for
Onan
®
P/N 300-0679
Engine Control Monitor 12V
FS P/N 56-0679-00
FEATURES and INSTRUCTIONS
