Originally Posted by 95Pop210
How long should it take for the 120 volt system to be stable when you start up a 2.8 Onan in an older Roadtrek. It use to take a couple of seconds for the microwave keyboard to start blinking, now it takes 10 to 15 seconds. Is this an indication of a problem? Thanks for your input
Assuming the Onan is coming up to speed properly, the delay period before the Onan transfers to and feeds the 120VAC breakers is typically controlled by a circuit board in the transfer switch that inhibits transfer long enough to allow the generator to stabilize its output. After the delay period is completed, the circuit board provides rectified 120VDC to the transfer switch relay coil. 2 seconds seems a little short. 10 seconds seems about right but the fact that this delay period has changed significantly could indicate that the transfer switch circuit board is starting to fail. Can you physically access the relay in the transfer switch box?