Thumbnail Filmstrip of 56-3056-00: Replacement Control Board for Onan 300-3056, 300-3687, 300-3950 Images
New Replacement Onan Generator Circuit Board
*Please verify actual board P/N in gen set – many 300-3056 boards have been upgraded to a newer style control board.
Flight Systems part number 56-3056-00 is an improved, direct replacement for the main control board used in several models of Onan Emerald and Marquis Series Gen Sets.
Features include improved circuit and harness design, heavy duty relays, added ignition circuit voltage protection and heavy conformal coating (to protect against corrosion - a major enemy of any RV generator control).
It is built in the USA and backed by a 2-year Warranty.
This board replaces the following ONAN part numbers: 300-3056, 300-3056-01, 300-3687, 300-3687-01, 300-3950
These control boards were used in the following Onan Emerald RV and Commercial Gen Set Models:
- BGE: Spec F,G
- BGEL: Spec E,F,G
- NHE: Spec D,E,F,G
- NHEL: Spec D,E,G
- BGD: Spec A-C
- NHD: Spec A-C
They were also used in the following Marquis Gen Set Models:
- BGM: Spec A
- NHM: Spec A
*If you are using this control in a model BGD or NHD generator, specs A-C, that has a built-in battery charger, please note:
You will have to remove a small jumper located on the top of this control board before installation. It is a very easy procedure, and detailed instructions are included with every purchase.
Return Policy: Unwanted items may be returned within 30 days of the original purchase date. Refund/credit issued will be subject to a 25% per item restocking/re-test fee as long as unit is in new, undamaged condition. Shipping charges are not refundable.