What happens when batteries are low in charge?

Don't get the best batteries if you don't have the best charger. Most camper chargers used to boil the batteries into being the same as a 5 year old battery in no time flat. Or should say they get boiled into oblivion.

So watch your charger, find out if it is a good one first.

And MARK battery cables......POS and NEG PLUS battery to battery Pos/pos & neg/neg

Mark them with different colored paint or tape so you know which goes where

If cables are different colors then just mark which is which

New batteries--------------yes buy matching batteries.

Batteries need to be the same age and from the same manufacture for best performance. Don't know where you came up with those numbers as they aren't group size numbers. Group 24 are about 85 Ah, the next size larger is group 27 at 95 to 105 Ah as typical 12 volt batteries in campers. Then there are GC-2's or golf cart batteries which are 6 volt. Properly cared for true deep cycle batteries can easily last 8 to 10 years.

Thanks for the help. I think that I have it figured out. I do believe that I need new batteries. There is enough of a charge to start the generator and run the fridge but don't know for how long. I did discover a toggle switch near the bottom of the generator. It's says 25 amp breaker. When I flipped the switch the generator switched the power over to the camper. The AC works and all the outlets also work while running on the generator only and disconnected from shore power. I've never tried to run this camper only on the generator. It's a 1998 Alpenlite and the generator only has 10 hours on it. I would have never found the switch on the generator as it's down low and in the dark and is also dark in color.

One question on the batteries. They is currently a group 95 and a 92 installed. Should they both be the same size? Best to install the same size and as large a size that will physically fit in the space?

I really enjoy solving these problems with all the input from all the experts.

You have TWO (2) electrical systems in your camper.

ONE is the 120V AC System......
Air Conditioner, Microwave, Fridge 'electric heat element', water heater 'electric heat element' and those OUTLETS work off 120V AC Power
Power comes from Shore Power when you plug your cord into power pedestal OR from generator.
Generator power gets to the AC Power Panel where the circuit breakers are either via a 'transfer switch' OR by plugging shore power cord into GEN OUTLET.

Other electrical.....12V DC System
Water pump, fridge controls/propane, water heater controls/propane, lighting.
Camper batteries supply the 12V DC SYSTEM when you no NOT have 120V AC power.
120V AC Power supplies CONVERTER which will power the 12V DC System and charge batteries in camper when you have AC Power/Generator

Truck can charge camper batteries via camper to truck cord when truck is being driven (provided you have truck 'tow/trailer' relay/fuses and 6 or 7 pin cord.

I see a few potential problems here. First of all the little lights on your battery meter are pretty much worthless for anything other than a very vague generalization of the health of your battery. For anything remotely specific you need an actual volt meter.
You apparently have mismatched batteries hooked in parallel. If one is 5 years and you don't know the other one I must assume it is likely even older. They both likely are near or at the end of their life.
The outlets in most campers, particularly truck campers will not work on battery power. To do this would require an inverter, something just about no TC comes with. They are usually only factory installed in high end class A motorhomes.
All of your AC outlets and appliances should work from your generator. I would think that most campers would have an automatic transfer switch. Yours may not be working. Alternatively there may be an outlet in a compartment near the generator that you have to plug your shore power cord into to get generator power. This is a common arrangement on Class C motorhomes. Assuming you have an automatic transfer switch it likely has a bit of a delay before connecting to the generator, possibly as much as 30 seconds. You might not be waiting long enough.

Here is a typical 30A Wiring COnfiguration...




Note the 12VDC Power Distribution Panel runs from both the 120VAC Converter and 12VDC Battery..

The 120VAC Power Distribution Panel run from eother SHore Power or your Generator...

A Power Inverter is an optional device that you install running from your LARGER battery bank to produce 120VAC to run those appliances as needed..

Roy Ken

Generally speaking, at 5 yrs. it is time to replace the Batt. I would replace both normally but espcially because the age of the second battery is unknown.

Outlets need 'inverted' power to work from batteries. If you're not seeing outlet power from a generator, that means there's a transfer switch that is likely not working properly. It's usually automatic.

That said, your rig may require you to physically plug your shore power cord into the generator.

It sounds also like your batteries are in need of replacement. 5 years is getting old.