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5STARDOORS · 03-17-2025, 04:29 AM

So I'm on a trip to Hot Springs AK. I'm in a 2017 Holiday Rambler. On the trip I kept getting a low house battery flash and it wouldn't allow me to turn on the lights. This is while the generator is on and also while hooked up to shore power. I figured the batteries needed to be replaced so I replaced ALL the batteries and I'm still getting the low voltage. My screen will flash every time the heat kicks on. Any ideas why this is happening?

BC Buck · 03-17-2025, 05:01 AM

First thing is check all connections are clean and tight.

5STARDOORS · 03-17-2025, 06:08 AM

I did, wire brush and cleaned everything.

workingonit · 03-17-2025, 06:19 AM

Measure your batteries. It says they are 12 volts. See if that is true.

YC1 · 03-17-2025, 06:19 AM

You must get voltage readings on the batteries and post those. It is just guessing without some real diagnostic information.

Inverter/converter or some poor connection not allowing the batteries to get a proper charge.

Take the voltage readings on the batteries and then start the RV and take the same readings.

Do these readings for the engine and house batteries.

Find your inverter and post a picture or at least the model.

Lantley · 03-17-2025, 06:46 AM

Is your converter functioning properly? What's the output voltage?

bobkat11208 · 03-17-2025, 01:03 PM

All of these are great suggestions. I’m sure you checked, but by some strange coincidence did you check the Salesman Switch didn’t get bumped? Stranger things have happened 🤷 especially if you’ve lost any other 12v power.

Dutch Star Don · 03-17-2025, 02:54 PM

Cleaning the battery cables is good, but did you follow the negative cables to the frame and check those connections. There could be several, including one back at the engine.

5STARDOORS · 03-17-2025, 03:06 PM

I've never heard of a salesman switch.

5STARDOORS · 03-17-2025, 03:14 PM

Okay never heard of it being called the salesman switch but definitely not that. It automatically switches back on by itself. I also don't have a volt meter with me but all the connections were already in surprisingly good shape almost zero clean up needed. Also why is it giving a warning at 12v. I'd get it if I got a warning at like 9v or something but 12 seems odd to me.

d23haynes57 · 03-17-2025, 03:24 PM

Quote:

Originally Posted by 5STARDOORS

Okay never heard of it being called the salesman switch but definitely not that. It automatically switches back on by itself. I also don't have a volt meter with me but all the connections were already in surprisingly good shape almost zero clean up needed. Also why is it giving a warning at 12v. I'd get it if I got a warning at like 9v or something but 12 seems odd to me.

When you get home have a house battery monitoring system installed. Also have a voltmeter that can also check the chassis batteries. The Victron 712 series has voltmeters for both.
As you in a campground ask for some help. At some point you should have a multimeter and some tools. Even just to have someone that offers to help have something to work with. It is possible those batteries are wired wrong.

SafariBen · 03-17-2025, 08:03 PM

With the generator on, or shore power hooked up, the inverter should be charging the batteries so at least 13V and possibly over 14V. Then when running on the batteries, the voltage should slowly drop from 12.6, down to 12.0V and that's a reasonable place to alarm for low voltage, even if you have half the battery capacity left.

With the chassis engine running, or generator, or shore power, you should have charging voltage at the house batteries, figure out why not. Try resetting the inverter, or breakers. If you're not handy with a multimeter, try a powerprobeIII.

Lv2Roam2 · 03-18-2025, 04:19 AM

Sometimes when these electrical gremlins appear - and have checked that everything's tight, breakers / fuses are good, etc. - I do a whole coach 12V reset (turn off the battery switches - wait 10 and turn back on). In a surprising number of cases the problem resolves - still don't know why. Last week it was our super slide - locks engaged / disengaged, 2 other slides worked fine - a reset got it working.

5STARDOORS · 03-19-2025, 09:30 AM

Now that you say that my slider did get stuck in for a bit before the trip and I couldn't figure out why then after about an hour or so it started working. I'll try this. Thanks.