battery not staying charged

What RedRocket said. I would first find out if the batt is good or bad before jumping through hoops. :h

RedRocket204 wrote:
Fully charge the disconnected battery, from the 5th, via your independent battery charger until full. Take the battery to the dealer, or auto-parts store and have them load test the battery. At least you will know if you are dealing with a good battery.

With a known good battery you can start troubleshooting other parts of the circuit. With a questionable battery you will always have doubts.

^^^^^There was a post on here last month about a poster having battery problems on his truck. Bought 2 new batteries. IIRC Both were bad?

Is the trailer plugged in? If so the converter s/b supplying the 12v power and charging the battery. First check the fuses then check the converter output voltage with your meter. Post the converter or power center model number for best answers.

Any chance the new battery was put in with reverse polarity? Black is usually positive and White is usually negative that grounds to the frame.

Fully charge the disconnected battery, from the 5th, via your independent battery charger until full. Take the battery to the dealer, or auto-parts store and have them load test the battery. At least you will know if you are dealing with a good battery.

With a known good battery you can start troubleshooting other parts of the circuit. With a questionable battery you will always have doubts.

It could be as simple as a loose connection between the converter and the battery. You should check the voltage at the converter terminals, and at the battery when you are plugged in. They should be the same. If not, it's either the negative or the positive line between the two. Check battery post terminals, and the positive and negative terminal strip connections at the converter. My battery would charge while I drove, and charge when I hooked up the external battery charger, but the negative wire was so loose at the converter terminal strip that is could not charge from the converter.

Check all switches. My trailer was at dealer for a new slideout switch and the tech turned on my awning light switch. I didn't figure out why my battery was draining for a week until I put the awning out and saw the lights on.

I would get a cheap volt meter that can also read amp draw and hook things up, turn things on and off, and see what's going on.

how's the water level in that new battery?

If your converter or charger is malfunctioning and overcharging the battery, it can boil it dry fairly quickly. If this happens, it can completely kill a battery, even a new one.

Alternatively, perhaps you have something turned on that draws a large current and just drains the battery quickly. Perhaps that something is something you have actually turned off, but for some reason does not obey the "off" instruction? You might try disconnecting the battery by removing one of the cables to see if the battery still won't hold a charge. If it doesn't, it is internally shorted out, and needs to be replaced, no matter how "new" it is. Then would begin the hunt for what killed it so quickly.

Good luck.