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Old 12-12-2018, 12:12 AM   #1
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Fan runs constantly on inverter

Should the fan on my investor be running all the time, even with the 50 amp cord hooked up? Also the light above my shower, my bathroom sink, my toilet room and the exhaust fan in toilet room have stopped working. I have a 2007 Sierra 335 RLT.
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Old 12-12-2018, 12:19 AM   #2
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I think you mean CONverter. All RVs have converters, few have inverters.
The converter fan running constantly, usually means a bad battery.
All the things you mentioned, are all 12v.
If the battery is dead, some 12v things may not work.
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Old 12-12-2018, 07:12 AM   #3
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I think you mean CONverter. All RVs have converters, few have inverters.
The converter fan running constantly, usually means a bad battery.
All the things you mentioned, are all 12v.
If the battery is dead, some 12v things may not work.
Agreed. First step is to check your voltage at the batteries. If your reading somewhere over 13.5 or so with the converter running, the converter is likely fine. Next disconnect from shore power and check the batteries again. If less than 12.6 you have a bad battery.
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Old 12-12-2018, 07:15 AM   #4
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A 2007 Sierra won't have an INverter, unless a previous owner installed one.
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Old 12-12-2018, 02:13 PM   #5
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Fan Running

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Originally Posted by Long1362 View Post
Should the fan on my investor be running all the time, even with the 50 amp cord hooked up? Also the light above my shower, my bathroom sink, my toilet room and the exhaust fan in toilet room have stopped working. I have a 2007 Sierra 335 RLT.
My experience (two different trailers) is that the fan on the CONverter runs whenever we are drawing more than 5-10 amps. It's providing that current from the shore power without drawing the batteries down. I can walk around turning on lights and after the third or fourth set the fan comes on every time. It's supposed to do that. (Helps that I have pretty weak batteries.)

If your fan runs "all the time", maybe you have some 12 volt consumer on that you haven't realized. Maybe running the refrigerator or water heater on propane, the furnace, an outside light you didn't notice.

Most 12v consumers are powered through the set of fuses (not the circuit breakers) on the fuse panel. You could remove them, one at a time to figure out what's consuming power.

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Old 12-12-2018, 02:19 PM   #6
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According to Brian Moran of FR. It is normal for the fan to run depending on how many amps are being used. Lots of draws you may not be aware of - smoke and CO detectors, battery charging, control circuits for WH, furnace, fridge, outside lights.

Perfectly normal.
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Old 12-12-2018, 02:39 PM   #7
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Also make sure the break-away pin didn't get inadvertently pulled.
It will make the brake magnets consume LOTS of voltage that you'd never see. (like in seeing a light left on)
So much so the CONverter fan would run constantly.

Maybe your battery(ies) are bad and the CONverter is trying to charge them constantly.
Have you checked them recently?

As far as the lights and fan that have quit working... have you checked fuses, switches and voltage?
First place to start is with the basics.
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Old 12-12-2018, 02:46 PM   #8
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When my CONverter fan ran constantly, I had a BAD battery.
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Old 12-13-2018, 07:32 AM   #9
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Ok. Thank you.
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Old 12-13-2018, 07:34 AM   #10
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I changed battery

So I bought new 27 series Interstate battery. Still have the fan running and lights and toilet fan not working
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