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Aftermarket Replacement Control Board for ONAN 300-C859, 300-0859



Aftermarket Replacement Control Board for ONAN 300-C859, 300-0859

Replacement RV and Marine ONAN Generator Circuit Board

Part number 56-C859-00 is an improved, direct replacement for the main control board used in the Onan CCK & NH (RV) Series Gen Sets.

Features include improved components, heavy duty rocker switches and heavy silicon based coating (to protect against corrosion – a major enemy of any RV or Marine generator control).

Despite being built during the 1970’s many remain in service in RV and Marine applications. Onan obsoleted this board in the early 1980’s and now only offer a relay conversion which is costly to install.

We manufacture improved replacements for Onan Generator Parts, ranging from older items such as the “Power Drawer” Controller found in 1970 GM motor homes to the regulator for today’s popular Emerald and Microlite Series Gen Sets. Our designs feature improved components, heavy duty connectors/terminals, and conformal coating to protect against corrosion.

All replacement Onan generator parts are designed to meet or exceed OEM specifications. We combine over 25 years experience in Generator Controls with our reverse-engineering capabilities to identify and eliminate the common problems found in many original circuit board designs.

Additional information

Weight 2 lbs
Dimensions 6 × 6 × 2 in
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