1994 Dutchman

[ArlintFamily]

So I've got a 94 Duthman on an Ford E350 body, with an:
Onan 4000 GenSet
Emerald Plus
Model : 4BGEA26100K
Generator.
I can't find the switch to transfer power from charging batteries to control the power on the inside. With it plugged in everything works. Without plugged in and Generator running I've got nothing, I've pushed everything switch I can find. So any help would be awesome

[persistent]

There are typically two ways built in gen sets are connected.

There may be a 30 amp outlet connected to the generator. Plug the shore power cable into the outlet.

There may be an automatic transfer switch (ATS). It automatically detects shore power and generator power and chooses one.

If yours has and ATS then it is not working.

There are many other possibilities that are less common.
12 volt Side of Life part 1
The 12volt Side of Life (Part 1)
12 volt Side of Life part 2
The 12volt Side of Life Part 2

[dsol]

I think the 30 amp outlet that Persistent mentions is likely the answer. I would bet your trailer does not have an ATS based on its 30 year old age—but admittedly that is a guess.

Look for that outlet and find that plug.

There is also a chance a breaker is flipped or possibly a blown fuse that comes from the generator. There are probably a pair of breakers on the generator itself and there is probably a fuse in a rubber fuse holder close to the generator on a wire that runs from the generator to supply the inverted power to the trailer.

Good luck.