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07-16-2020, 09:20 AM
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#1
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Established Member
Join Date: May 2019
Location: Baggs
Posts: 12
M.O.C. #23988
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No DC power
I have no DC power in spite of brand new 6 volt batteries x2 and completely replacing the converter in my 2016 3790rd. Battery shut off switch is on.
The stupid thing won't run the fridge, furnace, jacks or anything else unless plugged in to shore power or generator is on.
Just replaced the 75 Amp converter and it made no difference at all.
My battery panel says no charge but thats not true. Both batteries are fully charged on my separate charger.
What could possibly cause this?
Thanks
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07-16-2020, 09:34 AM
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#2
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,727
M.O.C. #7992
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Sounds like the battery shut off switch is in the wrong position. Many have complained that the wording is confusing. I'd switch it to off and see.
__________________
2006 3000RK
2009 Ram 2500
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07-16-2020, 09:40 AM
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#3
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Montana Master
Join Date: Jun 2017
Location: POINTBLANK
Posts: 1,916
M.O.C. #19944
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Quote:
Originally Posted by jimcol
Sounds like the battery shut off switch is in the wrong position. Many have complained that the wording is confusing. I's switch it to off and see.
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Or possible corroded contacts - the other thing I ran into was the ground to the frame was BAD - take it loose, grind it and reattach and then seal with battery sealer. - that was the devil to find.
__________________
RAM 22' DRW 3500 Crew LB 40 gal reserve tank / RETRAX Bed Cover / 2020 373RD HC / IS / MOPEKA Tank Monitor / Furrion Side&Rear Cameras
Slide Toppers / EMS-HW50C / Sailun 85's
3rd AC / Dometic 320
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07-16-2020, 10:35 AM
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#4
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Montana Fan
Join Date: Nov 2018
Location: Charleston
Posts: 488
M.O.C. #23094
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Would be a shame for all that expense and work just to be a simple thing as the battery cut off switch in the wrong position. If the red key will come out of the switch, you have it in the wrong position.
Switch could also be bad. Check voltage coming into switch vs. going out of switch.
__________________
2019 Montana HC 310RE
2010 Wildcat 29RLBS
2014 Ford F-350 Lariat 6.7
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07-16-2020, 11:27 AM
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#5
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,685
M.O.C. #4831
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It likely is not the disconnect switch as it does not cut off power to the jacks. The OP says the jacks don't work either.
With new batteries, I would suspect someone blew the reverse polarity fuses. But with a new converter too that doesn't seem likely either. Where I would look, and closely, is at the 12V flow from the battery to each of the 50 amp self resetting circuit breakers and on. I suspect one of them is bad.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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07-16-2020, 12:07 PM
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#6
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Montana Master
Join Date: Dec 2009
Location: Sebring
Posts: 3,669
M.O.C. #9969
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And to make sure those 6V Bats are hooked up in Series
__________________
Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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07-16-2020, 02:20 PM
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#7
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,892
M.O.C. #24086
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No DC power. Shore power good.
Take a multimeter. On shore power, check each post of your 50A self resetting circuit breakers near your batteries. They should all read the same (about 12.4vdc).
Now remove shore power. Check them again.
Which ever one is NOT showing 12vdc on the post, it is bad. Replace it.
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07-16-2020, 03:05 PM
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#8
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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I fixed a friends that did the same thing. Turned out to be fuses in the converter. They blew when the battery was connected in reverse.
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2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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07-16-2020, 03:50 PM
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#9
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Montana Fan
Join Date: Jul 2015
Location: Edgerton
Posts: 218
M.O.C. #17678
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My money is on the batteries being connected in parallel instead of series.
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07-16-2020, 04:20 PM
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#10
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Established Member
Join Date: May 2019
Location: Baggs
Posts: 12
M.O.C. #23988
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I have checked the reverse battery connect fuses all pristine. The Battery disconnect switch has been checked in both positions. The Ground for the battery to the frame is clean and tight.
Will check the 50 amp self resetting circuit breakers and get back to you!
Battery #1 is Positive terminal to Black terminal wire, Negative terminal via pigtail to positive terminal on Battery #2. Negative Battery #2 terminal connected via white white to ground on Frame which is clean and tight.
Pretty sure thats the right way to do it.
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07-16-2020, 04:41 PM
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#11
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Established Member
Join Date: May 2019
Location: Baggs
Posts: 12
M.O.C. #23988
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Quote:
Originally Posted by Daryles
No DC power. Shore power good.
Take a multimeter. On shore power, check each post of your 50A self resetting circuit breakers near your batteries. They should all read the same (about 12.4vdc).
Now remove shore power. Check them again.
Which ever one is NOT showing 12vdc on the post, it is bad. Replace it.
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I just did this readings as follows:
The self reset breaker visible on the right is 12.2 and 12.2 on shore power, then 12.2 and 12.2 with shore power off and batteries on.
The reset breaker that is hidden behind the battery box (why did they do that!) is 12.2 on the right pole and 0.00 on the left pole with shore power on and exactly the same with shore power off.
Not what I was expecting or hoping to see.
Battery #1 reads 6.0 V and Battery 2 reads 6.1 V just fyi
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07-16-2020, 04:44 PM
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#12
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Montana Master
Join Date: Dec 2009
Location: Sebring
Posts: 3,669
M.O.C. #9969
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Looks like you found your problem.
__________________
Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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07-16-2020, 04:47 PM
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#13
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Established Member
Join Date: May 2019
Location: Baggs
Posts: 12
M.O.C. #23988
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Quote:
Originally Posted by mhs4771
Looks like you found your problem.
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Are you saying the one that reads 0.00 is bad? That's not what I understood Daryles to be saying. ???? Or at least how I understood it.
Thanks!
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07-16-2020, 04:52 PM
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#14
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Montana Master
Join Date: Dec 2009
Location: Sebring
Posts: 3,669
M.O.C. #9969
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A circuit breaker should have the same voltage on each terminal, when it trips you then get Zero on the load side.
__________________
Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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07-16-2020, 04:56 PM
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#15
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Established Member
Join Date: May 2019
Location: Baggs
Posts: 12
M.O.C. #23988
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Thanks,
That makes sense but I was wondering what other electrical witchcraft was up because it was the same on shore power as battery power. But if that makes no difference then I certainly understand that! Thank you kindly!
Jim
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07-16-2020, 05:48 PM
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#16
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,892
M.O.C. #24086
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Quote:
Originally Posted by Fishinstreamers
Are you saying the one that reads 0.00 is bad? That's not what I understood Daryles to be saying. ???? Or at least how I understood it.
Thanks!
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Correct.
Paraphrasing here...
If it works on shore power, your conveter is good.
Power flows from the converter through the breakers to the load (systems) AND batteries (to charge them.
OFF shore power, the power flows from the batteries through the breakers to your systems.
Due to the way these thermal circuit breakers are made, they can work one way but NOT the other, much like a diode. I believe one of our members took one apart and found they are simply a bi-metalic switch.
Your normal circuit breaker pops open either/both ways
You can test it by bypassing the breaker with a jumper wire. BE DAMN CAREFUL!!!.
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07-16-2020, 06:17 PM
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#17
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Established Member
Join Date: May 2019
Location: Baggs
Posts: 12
M.O.C. #23988
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Quote:
Originally Posted by Daryles
Correct.
Paraphrasing here...
If it works on shore power, your conveter is good.
Power flows from the converter through the breakers to the load (systems) AND batteries (to charge them.
OFF shore power, the power flows from the batteries through the breakers to your systems.
Due to the way these thermal circuit breakers are made, they can work one way but NOT the other, much like a diode. I believe one of our members took one apart and found they are simply a bi-metalic switch.
our normal circuit breaker pops open either/both ways
You can test it by bypassing the breaker with a jumper wire. BE DAMN CAREFUL!!!.
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I think I will test it with a bypass. But I will be careful.
Thank you to all who helped out!
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07-16-2020, 08:14 PM
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#18
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,774
M.O.C. #12947
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Quote:
Originally Posted by Daryles
Correct.
Paraphrasing here...
Due to the way these thermal circuit breakers are made, they can work one way but NOT the other, much like a diode. I believe one of our members took one apart and found they are simply a bi-metalic switch.
Your normal circuit breaker pops open either/both ways
You can test it by bypassing the breaker with a jumper wire. BE DAMN CAREFUL!!!.
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The thermal breakers in these rigs work in both directions. When connected to shore power, the converter is producing 12 volts DC and some of that voltage is charging the batteries through the breaker. When not connected to shore power, that 12 volt DC power is traveling through the breaker from the batteries into the main panel. If the breaker gets hot enough from loading, it doesn't matter which way the power is flowing, it will open up the circuit. Once it cools down, it will close if it is an automatic breaker. If it's a manual reset breaker, it will have to be reset manually.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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07-18-2020, 09:32 AM
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#19
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Seasoned Camper
Join Date: Apr 2017
Location: Arkansas
Posts: 53
M.O.C. #19741
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while we are on this subject....similar situation...found the battery was cooked...we keep it on shore power at the house so battery was baked out...I have a disconnect switch I want to install . Can I put it on the ground side of the battery ? The hot side will still have power coming into the battery , will this still cause my battery problems ?
__________________
Brian & Pam
2017 305RL High Country
2005 F-350 Lariat
6.0 Power Stroke Diesel
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07-18-2020, 10:18 AM
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#20
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Montana Fan
Join Date: Jul 2015
Location: Edgerton
Posts: 218
M.O.C. #17678
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Before we answer your question, we need more information to give the proper answer. What is the ultimate goal in using thIs cutoff switch?
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