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Well, the generator not charging nor powering the A/C but shore power will is a different issue from the chassis engine not charging while driving.
So lets take the generator issue first. Your AC from the generator is probably off due to the generator not being set correctly or not being switched by the ATS or manual method. Does the microwave also not work. Then that is almost certainly the generator breaker or a power switching problem.
Onan generators have a breaker that can be reached by removing the access cover. On my QG4000 it is on the lower left and looks like a toggle switch. See if that breaker is on. If not that is the problem.
If the breaker was on then it is probably the generator switching. MHs do it two ways. The old way is a 30A outlet inside a compartment that you plug in your shore power cord when you want generator power but plug it in to the shore power pedestal when you want that power. It is simple and positive. It doesn't fail but you have to do the manual switching.
The other way is an automatic transfer switch (ATC) that does that switching for you.
Either you have the old way and you are not plugging in the shore power cord correctly or if you have an ATS that is bad which is often the case.
Now lets talk about the chassis engine not charging. MHs have an Intellitec bidirectional isolation relay delay (BIRD) or a Precision Circuits battery isolation manager (BIM) which connects the chassis batteries to the coach batteries to charge them. Some have nothing, but a 2017 MH probably has the BIRD device.
Measure the coach batteries voltage while resting and little load is on it. It should read 12.5-12.8 volts if the batteries are near fully charged. Then start the chassis engine, wait a few minutes and check the battery voltage again. It should have gone up above 13.0. If it has all is working ok but realize that the chassis alternator is a fixed output voltage and doesn't charge very fast.
If the voltage stays the same then the BIRD is probably bad. Most likely it has the Trombetta isolation relay that goes bad and is easily replaced.
Good luck. Let us know how it turns out.
David
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