My RV Batteries Won't Retain Charge For More Than 12 Hours

by Lynn Guyer
(Cottonwood, Idaho USA)

Question: I have a 2006 Keystone Cougar 28'. The last two times I have had it out the batteries would not hold a charge for more than 12 hours. Usually I could stay out 3 to 4 days before running the generator. This past weekend I went back to town and bought two new batteries. They were dead before morning. Any idea what would be causing the draw?

Robbie: There is a simple test to see if you have a draw on the system. All you need is a 12V test light and needle nose pliers and a second person to hold the test light and yell when the light goes out.

NOTE: If you have push button battery disconnects, this test won't work. Let me know if you do and I'll explain the second test you can do.

Remove the positive connection from the battery. Put one end of the test light on the battery positive and the other on the wire you disconnected. If the light comes on you have a draw on the batteries...

If the light is ON do the following:

Take the needle nose plyers to your converter or main 12V fuse panel and remove one fuse at a time until the test light goes out. When the light goes out you've found the draw on the system, or at least have an idea if you know what the fuse you pulled goes to.

If the light remains on after pulling all the fuses, call a tech.

Good Luck...

Comments for My RV Batteries Won't Retain Charge For More Than 12 Hours

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Jan 09, 2012
Batteries won"t retain charge
by: Larry Patterson

i do have a "rocker switch" for my battery disconnect. do i need to do something different from what your article said? thanks for your help!!

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Robbie Warford, San Diego RV Repair

Hi, I'm Robbie. Welcome to!

Like the name implies, this site is all about helping you save money while keeping your RV in tip-top shape--and that is all about you having the knowledge to do so.

I've been a technician in the RV industry for 30 years, operating out of San Diego, California. And let me tell you, I love my job.

But I also love empowering RVers with the knowledge they need to make the right decision on repairs, or to make the fix themselves--and that, my friend, is the reason for this website. I hope you enjoy.

Or, learn more about me, my RV service practice, & this website here.