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04-08-2021, 07:06 PM
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#1
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Junior Member
Join Date: May 2012
Location: Illinois
Posts: 18
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12V power issue
I have a 2021 30RLS. I want to boondock sometime, I don't have any 12V when unplugged from shore power, other than the leveling system. No lights, no in command, no fridge, etc. Batteries are good, battery shutoff is properly secured. What should I be checking?
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04-08-2021, 08:19 PM
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#2
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Senior Member
Join Date: Jul 2013
Location: Box Elder
Posts: 2,910
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Your battery disconnect must be turned to the position, which may say ON, so when connected to AC power, the converter is supplying power to the batteries. If you have the battery disconnect OFF, your converter is providing 12 volts at the panel but you aren't keeping the batteries charged. When not connected to AC power and the disconnect is turned OFF, your batteries are not connected to the panel, so if you are trying to boondock, you may have power in the batteries, but it isn't getting to the panel. Why did you turn off the disconnect?
__________________
Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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04-09-2021, 05:54 AM
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#3
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Junior Member
Join Date: May 2012
Location: Illinois
Posts: 18
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The battery disconnect is on
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04-09-2021, 05:58 AM
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#4
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,357
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Check the reverse polarity fuses.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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04-09-2021, 06:07 AM
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#5
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Senior Member
Join Date: Aug 2012
Location: Waco, Tx
Posts: 5,457
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Look for a couple of these close to the batteries.. check and see if 12 volts are on both poles of them ..
__________________
2015 Ford F350 DRW 6.7 Diesel XL
2020 Avalanche 313 RS
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04-09-2021, 06:42 AM
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#6
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Site Team
Join Date: Oct 2011
Location: Joppa, MD
Posts: 11,763
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Quote:
Originally Posted by lc47
The battery disconnect is on
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Can you remove the battery disconnect key? If you can remove it then the battery is disconnected.
__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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04-09-2021, 09:28 AM
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#7
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Junior Member
Join Date: May 2012
Location: Illinois
Posts: 18
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What do these reverse polarity things look like, and where are they? And, no I cannot remove the disconnect key, so battery is connected.
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04-09-2021, 09:45 AM
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#8
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Site Team
Join Date: Oct 2011
Location: Joppa, MD
Posts: 11,763
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Quote:
Originally Posted by lc47
What do these reverse polarity things look like, and where are they? And, no I cannot remove the disconnect key, so battery is connected.
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The polarity fuses are typically 2 40 amp ATO fuses on the lower part of the power distribution panel. Some panels have them mounted on the back f the panel. Turin all power off anmd disconnect the battery before replacing.
__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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04-10-2021, 02:25 AM
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#9
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Senior Member
Join Date: Oct 2020
Location: Port Charlotte
Posts: 240
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Quote:
Originally Posted by lc47
The battery disconnect is on
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How do you know this?? The red light on at the switch means that 12 volts are present not whether the switch is on or off. The switch controls a latching relay. There is an inline resettable fuse within 6' of the battery. There are 2 "Reverse Polarity" fuses In the fuse panel not in line with all the other 12 volt fuses. They will be labeled "Reverse Polarity" right on the circuit board. Not on the fuse box label.
There are variations to this but all are basically the same. The power does not usually go thru a standard switch as light does.
__________________
2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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04-10-2021, 02:31 AM
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#10
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Senior Member
Join Date: Oct 2020
Location: Port Charlotte
Posts: 240
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Quote:
Originally Posted by lc47
What do these reverse polarity things look like, and where are they? And, no I cannot remove the disconnect key, so battery is connected.
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The reverse polarity things are standard automotive fuses just like all the other 12 volts fuses in the RV. There are usually 2 sometimes 3. They are off to the side by themselves.
__________________
2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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