Low Battery Voltage

Do you have a 12 volt compressor refrigerator? If so, what is the power consumption vs. the battery specs? Just one battery?

If plugged in and showing 13.6, does not mean battery was fully charged. However if battery showed only 6.3, after just being unplugged overnight, with minimal draw, I'd say you need a new battery.

Did a competent person load test your battery, and say it was fine? Unless your battery has been abused, often times allowed to drop to 50% or less, it should have lasted more than two years.

A four hour trip should have charged the battery some, but if very low to begin with, not enough to operate the slide on it's own.

I'd have it load tested again, as it should not drop to 6.3 overnight. I think you will be needing a new battery.

Jerry

Check the DC distribution panel for battery voltage with shore power disconnected and tow vehicle disconnected. Possible that the charge line from TV is not providing power. Possible that battery fuse in distribution panel blown.

An RV battery or batteries drawn down to 6.3 volts is toast. You have an issue, yes, but buy new batteries when solved.

Mr. C wrote:
2020 Keystone Cougar 26RBS. After a 4hr trip home, low voltage prevented the slide from opening. The fridge was running during the trip. Plugged in and opened the slide. The next day I had the battery tested and it's fine. I verified that the truck charges the battery. Yesterday, with battery at 13.6, I unplugged. Fridge was running. This AM, 6.3 volts.

What direction do I need to head? Only the fridge and propane detector were running on the battery.

put your fridge on propane, and get new batteries. if you ran it down to 6V its toast. I am saying to put your fridge onto propane as when I looked up your model it saud propane/electric fridge so I am asuming you have a 2 or 3 way.

Steve

OP: You say "battery". Do you have only one?
What size is the battery you have in the rig? Is it 12 volt or do you have a pair of six volters? If six volters, they are wired wrong

Lwiddis wrote:
An RV battery or batteries drawn down to 6.3 volts is toast. You have an issue, yes, but buy new batteries when solved.

So if a battery gets discharged to that point it is no longer usable, even if recharged?
I had a battery that was dry, sitting in the garage zero charge in it. I filled with distilled water, trickle charged it for a few days and it went back in service with no issues. A load tester can be had at HF that is equal to or as good as any I have ever used and will give you accurate analysis of the batteries condition.

The battery was tested at Advance Auto Parts. They said it had more than the stated CCA. Battery is the original/3yrs old. The fridge has been running on propane. I will have the battery retested somewhere else, and will hook up a different battery and retest. Hoping it's just the battery and not something else.

I have verified that the TV is charging the battery, and this is reflected on the InCommand screen.

Mr C,

How many amp-hours is the battery?

The Incommand is in your TV, correct? Just because power is leaving the truck doesn't mean it is getting to the trailer's battery.
Need to measure voltage right at the battery.