Are my Batteries going bad?

What is the voltage to the batteries when towing?

our 4 batteries were new in Oct of 09 replaced in Dec of 14. Now it is 18 and I will be watching them and new will be installed. Batteries are the same thinking I have about tires. Earlier is better than later. have a great winter everybody. We are hitting the road tomorrow for Az one month later this season.

chevman

Yes the truck is supplying power to the RV while towing. I drove 30+ hours from SoCal to DFW TX and the frig was at 0 and 38 upon arrival, this was about 10 months ago.

So I am thinking the batteries are being sucked dry faster than they can charge because they are getting tired.

I agree 4 years is a long time for RV batteries especially no name.

Just thought I may be missing something.

Start the vehicle and then measure the battery voltage. IF the voltage goes up to 13.5 or more then you know the charging system is functioning, however the connections on the batteries must be spotlessly clean.

That said, four years is plenty on unknown batteries. A hydrometer and load test would help but you already did a load test by running the refer. Lots of little unknowns here but one does not BUY batteries, we just rent them.

If you use hookups mostly you can nurse more time out of the batteries but it is not worth the hassle. Too many things rely on good batteries.

At 11.5 volts the battery is about dead. Is charging voltage being supplied to the battery while under way?