ET-500 Onan Node

The Onan Node is a language translator. It translates RS232 to RS485. Its commonly found on older Country Coaches.

[If electrical panel is on passenger side then unit is under bathroom sink behind false wall on left. If electrical panel is on driver side (Hood River floorplan is but others may be this way) then unit is behind inverter control panel.]

If you can start / Stop the genny--but are not receiving info from in, its likely this board has failed. Whereas the start/stop passes directly through this board, the weaker link is in the translating.

They can be reordered from Onan/ Dealer.