Battery Charging Issue

You are putting camper batteries on the truck?
You will always have some current leakage on vehicle wiring even with nothing turned on.
Charge the batteries, hook up ammeter and check how many ampere it takes, whatever it is.

I was typing on my phone, let me try now at a PC. I was about to load my TC on my truck. Its been in my shop for several months plugged into a 50 amp circuit (with 30a adapter). Yesterday I noticed a beep every few minutes, but assumed it was the smoke detector. Batteries were low (3.5v) when I checked. I just need to troubleshoot the battery charge circuit.

"AC was on" Do you mean you were plugged into shore power?

If you suspect the the stock charger converter isn't charging you can test this by plugging in the camper and testing voltage at the output terminals of the charger converter. You can also test for 120v where the charger plugs in. If you have the 120v but not the ~13v at the output you have solved the issue. You need a new converter charger.

The batteries at 3.5v is no bueno. I would have it load tested to see if you are shopping for new batteries.

I play with lot of batteries for years.
Motorhome, boat, tractor, PWC.
Over the years learned the hard way, that when you leave electrical connected, something will go wrong sooner or later.
Bad connection here, bad connection there, charging is not engaging and discharging still works.
The best for me is pull battery clamps for 6 months storage, or pull the battery out and hook up one of those $5 maintainers on it.

I just replaced & upgraded my "converter" to a 3 stage version. After a relatively easy install it went through all 3 stages, very happy!

I changed it out I found my battery down to 6v after replacing it last year. I also had issues with low voltage in the TT, noticed dim lights. And a led flickering.

Kayteg1 wrote:
I play with lot of batteries for years.
Motorhome, boat, tractor, PWC.
Over the years learned the hard way, that when you leave electrical connected, something will go wrong sooner or later.
Bad connection here, bad connection there, charging is not engaging and discharging still works.
The best for me is pull battery clamps for 6 months storage, or pull the battery out and hook up one of those $5 maintainers on it.

Well there are some good maintainers and some bad...
The bad ones actually will put a drain on the battery...Sad but true.

One is the inexpensive Harbor Freight maintainer. Just disconnect the shore power from the maintainer and notice the led is still lit..

Jim

The converter supplies the running and charging 12 volt power to the camper and battery.
Need to verify 120VAC input to the converter and about 13.6VDC output.
Converter can usually be found in or near the 120/12 volt distribution panel where all the breakers and fuses are.

3.5v on the battery is bad news. Good chance the plates warp and short out. Watch for excessive bubbling as they get close to 13+ volts. May take some extra time to charge and verify condition. Like 24 hours.

The 12 Volt Side of Life

The battery charger on my Open Range 5th wheel went bad and I replaced it with a Boondocker converter Very satisfied with both product and seller. that vehicle stays plugged in 7x24 all its life.
But signature makes me think you have a 2018?

Reset the GFI outlet. on my AF its on an outlet below the sink (press test, then reset).
Check the AC breaker for charger in the breaker box. move it all the way to off side, than reset it to on side.
plug something else into the outlet the charger is plugged into, does the outlet have AC?
Check the 2 fuses on the back side of the charger, then can blow if wires are crossed.
on my 990 the charger is below that folding top on the step up to the bed, on LS. its a big silver box that probably says progressive dynamics on it. It has 2 heavy 12V wires going to it (white and black, where black is positive). it also will have an AC cord coming out that has a 15a plug on end that plugs into an outlet down inside step.

I think the converter is under the step by the front window. I need to open the slide to get to it. I am slowly raising the camper to get it on my truck and move it out in the sun. I have not upgraded my solar yet so just the 20 amp panel. I figure anything should help.

if its a bad converter, you can put a battery charger direct on batteries to bring battery up faster. Hell even plugging your camper into your truck should bring the voltage up. (unless you got a bad battery.)