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03-05-2021, 08:40 AM
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#1
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Senior Member
Join Date: Apr 2017
Posts: 386
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Four 6V batteries to 12V wiring question
I want to clean up the battery bay wiring
The Magnum ME 2012 is in a separate bay before the battery bay.
The positive and negative cables from the Magnum come through the wall to the battery bay.
The Magnum positive cable is on the first battery positive post. The Magnum negative cable is on the second battery in line on the negative post
Maybe to keep the negative cable short as possible?
Is that the correct way of wiring? My fourth battery in line has the negative cable to the BMK other end has negative chassis cable
sketch of how the wiring is
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03-05-2021, 09:10 AM
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#2
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Senior Member
Join Date: Jul 2014
Posts: 35,419
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Your set up wrong. If your inverter negetive is NOT on the shunt, no inverter or charging is being monitored.
All RV negetives must go to one side of the shunt.
All battery negetives must go to the other side of the shunt. 
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03-05-2021, 10:21 AM
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#3
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Senior Member
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 9,941
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Well,
I never have known what "shunt" is for. But, pretty sure I don't have one. Our coach is an '04 Itasca Horizon 36GD with the CAT C-7 330HP. It was originally setup with a Dimensions 2000 Watt Inverter/Charger that lasted for about 11 years or so. It was a MSW design. I replaced it with a Magnum ME2012 which is also a MSW Inverter/Charger.
I have traced the large cables from the coach batteries, all the way across the coach, to the Inverter/Charger and, there is NOTHING in line with any negative cable. I do have a 300A fuse for the positive side that is directly above the coach batteries. I also have the temp signal sensors on the batteries. There is a phone type cord from the Magnum to it's remote control inside the coach.
That remote tells me everything that's being sent to the batteries (coach) and their status. Right above that remote is the toggle for checking either set of batteries. But, I'm pretty sure I have no shunt.
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '20 Honda NC750X DCT
 2018 Goldwing Tour DCT Airbag
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Heidi character, (mini Schnauzer)!
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03-05-2021, 10:37 AM
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#4
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Senior Member
Monaco Owners Club Forest River Owners Club
Join Date: Jul 2012
Posts: 3,329
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The shunt is the only way of tracking in/out of the battery. any battery gauge /state of charge is just a guess without it.
All power to and from the battery must flow tru it. battery to shunt one side with all other power in/ out on the other side I can't remember how my Winnie of that vintage was wired or if it even had one.i doubt it
with my current and any future coaches I wouldn't be without one to properly judge battery condition. Since you making changes You might consider properly wiring one in if not there with a proper battery monitor
__________________
2023 Coachmen Encore 325SS
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03-05-2021, 10:54 AM
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#5
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Senior Member
Join Date: Apr 2017
Posts: 386
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Thanks Twinboat, I didn't think it was right, it is how I got it from previous owner
I'll get a new longer negative for the Magnum to the back side of the BMK shunt
__________________
2008 Mandalay 43A FL XC ISL 425 '16 GC, Blue Ox 10K Avail Apollo aux braking and TSD Member
1996 Winnebago Vectra 230 DP 2000 Fleetwood Tioga Montara
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03-05-2021, 10:58 AM
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#6
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Senior Member
Join Date: Apr 2017
Posts: 386
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This is the shunt Twinboat is referring to
__________________
2008 Mandalay 43A FL XC ISL 425 '16 GC, Blue Ox 10K Avail Apollo aux braking and TSD Member
1996 Winnebago Vectra 230 DP 2000 Fleetwood Tioga Montara
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03-05-2021, 11:10 AM
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#7
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Senior Member
Join Date: Jul 2014
Posts: 35,419
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Quote:
Originally Posted by FIRE UP
Well,
I never have known what "shunt" is for. But, pretty sure I don't have one. Our coach is an '04 Itasca Horizon 36GD with the CAT C-7 330HP. It was originally setup with a Dimensions 2000 Watt Inverter/Charger that lasted for about 11 years or so. It was a MSW design. I replaced it with a Magnum ME2012 which is also a MSW Inverter/Charger.
I have traced the large cables from the coach batteries, all the way across the coach, to the Inverter/Charger and, there is NOTHING in line with any negative cable. I do have a 300A fuse for the positive side that is directly above the coach batteries. I also have the temp signal sensors on the batteries. There is a phone type cord from the Magnum to it's remote control inside the coach.
That remote tells me everything that's being sent to the batteries (coach) and their status. Right above that remote is the toggle for checking either set of batteries. But, I'm pretty sure I have no shunt.
Scott
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A shunt is for a battery monitor, not standard equipment on most RVs.
It works like a gas gauge, measuring amps in and amps out of all battery usage.
A remote, on an inverter charger, only shows charging and discharging rates along with battery voltage of its use.
It does not monitor house loads or solar charging.
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03-06-2021, 10:05 AM
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#8
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Senior Member
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 9,941
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Quote:
Originally Posted by twinboat
A shunt is for a battery monitor, not standard equipment on most RVs.
It works like a gas gauge, measuring amps in and amps out of all battery usage.
A remote, on an inverter charger, only shows charging and discharging rates along with battery voltage of its use.
It does not monitor house loads or solar charging.
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Roger that Sir, thanks for the explanation. Nope, I for sure do not have one.
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '20 Honda NC750X DCT
2018 Goldwing Tour DCT Airbag
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Heidi character, (mini Schnauzer)!
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