Onan Microquiet 4000 Generator - 1999 Tioga
Onan Microquiet 4000 Generator will only start and run continuously with coach vehicle running. Shouldn't I be able to start the generator from the coach batteries or when connected to 120v shoreline?...
Forum Discussion
Yes. The Onan should run even with the house battery disconnected once it is started and with no connection to the engine.
My guess is either the Onan is not producing 12 volts, or something is pulling down the 12 v supply. It might even be as simple as bad grounds, and getting ground through the chassis engine circuits. When the Motorhome starts, the relay that is energized by the ignition wire is connecting the engine 12v system to the house battery to charge it. This is supplying the 12 v to keep the genset running right now.
Once the AC power from the genset turns on, and the converter in the house portion is turned on, will the Onan stay running? In my old C I could tell the AC had come on once the microwave display powered up and the genset RPMs dropped down for a moment.
There are basically 4 sources or 12 v available and really any ONE of them should keep the genset running, assuming it is a good source (not say a fully discharged battery): 1) the house battery, 2) the house AC to DC 12 v converter, 3) the alternator on the chassis engine and 4) the chassis battery.
So for example, without starting the Motorhome engine, I would expect that if you press the switch that joins the batteries, the Onan probably also runs.
Jim
My guess is either the Onan is not producing 12 volts, or something is pulling down the 12 v supply. It might even be as simple as bad grounds, and getting ground through the chassis engine circuits. When the Motorhome starts, the relay that is energized by the ignition wire is connecting the engine 12v system to the house battery to charge it. This is supplying the 12 v to keep the genset running right now.
Once the AC power from the genset turns on, and the converter in the house portion is turned on, will the Onan stay running? In my old C I could tell the AC had come on once the microwave display powered up and the genset RPMs dropped down for a moment.
There are basically 4 sources or 12 v available and really any ONE of them should keep the genset running, assuming it is a good source (not say a fully discharged battery): 1) the house battery, 2) the house AC to DC 12 v converter, 3) the alternator on the chassis engine and 4) the chassis battery.
So for example, without starting the Motorhome engine, I would expect that if you press the switch that joins the batteries, the Onan probably also runs.
Jim
