Page last updated Sep 19, 2026 @ 11:49am
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300-4294 300-4295
300-4296
300-4297
Replacement Engine Controllers
Replacement Onan Generator Circuit Board
These are direct replacements for the 12V and 24V Engine Controllers used in several models Onan Gen Sets. This version (which was updated in May 2017) has been upgraded with new features that will improve your efficiency in the field and extend the lifetime of the board.
New Features Include:
Microprocessor Based Logic for Enhanced Reliability
Auto-reset on Initial Power-up
Plainly Marked DIP Switches for Feature Selection
The Use of Jumpers has been Eliminated from our New Design
Accurately Labeled LED Indicators for More Efficient Troubleshooting
Solid-state AC Voltage Sensing for Crank Termination
Protection Against Voltage Surges and Reversed Polarity
We Have Upgraded the Common Alarm Output to 5 Amps
Solid-state Voltage Outputs for Remote Panels
Lamp Test for Both the Board and the Remote Panel
An Added Barrier Strip for the Alternate Connection of the RUN/REMOTE Switch
Network Capable with a Modbus Option
It is built in the USA and backed by a 2-year Warranty.
12V board
Item Number: 300-4296
Price: $982
Price last updated 9/14/2026
Shipping Weight: 2 lbs.
This item normally ships in approximately 3 days or less.
24V board
Item Number: 300-4297
Price: $982
Price last updated 9/14/2026
Shipping Weight: 2 lbs.
This item normally ships in approximately 3 days or less.
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