Originally Posted by DNOLB
New to the forum but such a helpful site!
Just wondering if we are doing something wrong with the batteries. We have found that they don't last very long and trigger the alarm for low battery.
We will charge them up before leaving on a trip (attached to electrical at the house) then likely drive an full 8 - 10 hour day. Once we stop we may turn on lights for a short time, but are conscious of using any power. Don't use the microwave or what we think are power using things. We are always finding that the battery alarm will go off about 4 hours after we stop driving. The only thing that may be running seems to be the fridge although it is on gas but it seems it still takes some electrical. We turn off all the lights, no A/C or TV running.
Do we need to replace with better batteries or perhaps there is something wrong with the ones we have? The unit is only 6 months old. Sadly our dealer doesn't seem to have any answers for us.
Any suggestions would be welcomed.
You may have bad batteries. Do you have two? If one battery is bad it will also draw from the other.
After charging them while connected on shore power, read the voltage using a voltmeter. You should see 12.5 or 12.6 volts if fully charged. If that's the case then it appears the converter / charger is ok.
If they're still fully charged after you drive the 8 or so hours, then your chassis alternator is also charging them ok.
I would remove the batteries and take them to an Advance Auto Parts, NAPA or similar where they can be tested. Rule out whether or not the batteries are bad.
If they're bad, see if they are covered under your (assumed) 12 mo. Forest River warranty. I don't think they are, unfortunately. But at least you'll know.
If they're good, then something in your coach is sucking life out of them. A/C's do not use battery. I was thinking in that case I would pull all 12 volt fuses, then wait an hour before re-inserting each 12 volt fuse to see if you can isolate the culprit. If there's one for the fridge turn it off first before pulling the fuse.