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11-09-2009, 04:25 PM
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#1
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Montana Master
Join Date: Nov 2004
Location: Oak Harbor
Posts: 1,530
M.O.C. #2471
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DUAL 6 VOLT BATTERY UPGRADE
Okay...going on the premise that there are no stupid questions, I will ask away. When I connect the two 6 volt batteries, does it matter if I connect the cables from the coach to the terminals of the batteries before I connect the batteries in series or can I connect the batteries in series and then connect the cables from the coach to the batteries, or does it even matter  Any input as always is appreciated.
Jack
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Previous:2004 Mountaineer 325FKBS,2010 Montana 3455SA Now:2018 Bighorn 3575EL (SOB's  ) Res. Fridge,W/D,Disc Brakes,Water Softener,Dish Tailgater PRO,LioN Batts, several mods.
2021 RAM 3500 Laramie.... "LOADED", 4x4, SB H.O. 6.7L, Aisin Trans, PullRite Super Glide Hitch, 52 Gallon Titan Fuel Tank.
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11-09-2009, 05:24 PM
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#2
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Montana Master
Join Date: Nov 2003
Location: Santa Fe Springs
Posts: 4,189
M.O.C. #639
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When I did my change to 2 sixes from 2 twelves I had both of my 6's connected to make 12 volts just to make sure it was 12 VDC then I connected the trailer to it, but I dont see why your way wont work other than a possable spark when you conect the 2 sixes together from the items that are always on in the trailer.
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Pulling a 2004, 2980 RL an oldie but goodie.
Tow vehicle is a 2009 RED RAM 3500 DRW.
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11-09-2009, 05:43 PM
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#3
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Montana Master
Join Date: Nov 2004
Location: Oak Harbor
Posts: 1,530
M.O.C. #2471
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Quote:
quote:Originally posted by Trailer Trash 2
When I did my change to 2 sixes from 2 twelves I had both of my 6's connected to make 12 volts just to make sure it was 12 VDC then I connected the trailer to it, but I dont see why your way wont work other than a possable spark when you conect the 2 sixes together from the items that are always on in the trailer.
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That's what I was thinking of doing and for that same reason. I know how to hook them in series, but this website: Batteries has you connecting the batteries to the rig before connecting them in series. OBTW, it is the only website I have found that even gives a sequence for connecting everything. I think it would be more important to make sure you are getting 12 volts before connecting the batteries to the rig.
Jack
__________________
Previous:2004 Mountaineer 325FKBS,2010 Montana 3455SA Now:2018 Bighorn 3575EL (SOB's ) Res. Fridge,W/D,Disc Brakes,Water Softener,Dish Tailgater PRO,LioN Batts, several mods.
2021 RAM 3500 Laramie.... "LOADED", 4x4, SB H.O. 6.7L, Aisin Trans, PullRite Super Glide Hitch, 52 Gallon Titan Fuel Tank.
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11-09-2009, 05:52 PM
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#4
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,363
M.O.C. #4831
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I'm with you Jack (and Trailer Trash II). I would want 12V first, then connect to the frame. The other way may work, but I envision a potential spark condition when making the last contact (to create 12V and connect everything into one circuit).
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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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11-09-2009, 07:39 PM
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#5
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Montana Master
Join Date: Oct 2004
Location: Gardnerville
Posts: 749
M.O.C. #2165
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It's amazing how fast the smoke escapes if you happen to hook those things up in just the wrong way. I'd also, based on hearsay, of course, not experience, suggest hooking the batteries together first and double checking for 12V before connecting to the rig.
Bob
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11-10-2009, 01:17 AM
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#6
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Montana Master
Join Date: May 2003
Location: New Bern
Posts: 4,294
M.O.C. #311
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My initial reaction is NO it does not matter. You do not complete the circuit until the two batteries are connect in series.
My second comment is that I would connect so it is easiest to prevent electricity from flowing until the last connect is made.
My final comment is YES it does make a difference for safety. If you connect the trailer to each battery first and then connect the two batteries there is a BIG chance the jumper cable could touch the trailer during this process. This would either short the positive of on six volt battery to the trailer or apply six volts to the trailer if it was the ground side of the battery to the trailer. (NOTE-Thanks to Carl N Susan for their comment and making this possibility apparent.)
So I recommend connecting the batteries first. Putting the Positive lead from the trailer on the batteries first and finally putting the ground or negative from the trailer on the batteries completing the circuit.
GREAT QUESTION.
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11-10-2009, 03:49 AM
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#7
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Montana Master
Join Date: Nov 2004
Location: Oak Harbor
Posts: 1,530
M.O.C. #2471
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Thanks for all the inputs.....as usual the MOC comes through. I will hook the batteries in series first to verify 12 volts and then complete the connections as John has recommended. I won't be doing this for a week or so but will report back when it is completed. Thanks again.
Jack
__________________
Previous:2004 Mountaineer 325FKBS,2010 Montana 3455SA Now:2018 Bighorn 3575EL (SOB's ) Res. Fridge,W/D,Disc Brakes,Water Softener,Dish Tailgater PRO,LioN Batts, several mods.
2021 RAM 3500 Laramie.... "LOADED", 4x4, SB H.O. 6.7L, Aisin Trans, PullRite Super Glide Hitch, 52 Gallon Titan Fuel Tank.
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11-10-2009, 06:33 AM
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#8
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,707
M.O.C. #7992
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I think I would also kill the 12volt main breaker in the panel before hookong to the trailer. Once you are hooked up and 12 volts verified then flip the main back on. I am not sure this is necessary but I prefer to make connections when there is no or very little load on them.
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2006 3000RK
2009 Ram 2500
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11-10-2009, 06:40 AM
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#9
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Montana Master
Join Date: Jan 2008
Location: Portland
Posts: 1,107
M.O.C. #8045
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I would be careful which ever way you use to make sure there is NO spark near the batteries. We had some old work utility trailer batteries blow, and I mean a big BOOM. Fortunately no one was close when it happened but a welding spark lit the thing off. So I would caution to see you make no spark over the batteries. Granted I have many times jumped the batteries and made spark but if all things are in the "improper" order they go boom.
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11-10-2009, 12:20 PM
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#10
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Montana Master
Join Date: Jun 2007
Location: Eastern
Posts: 1,155
M.O.C. #7270
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When hooking up a golf cart you hook the batterys together first then hook the pos up and hook the neg last. thats the way we do it on 48 volts. Neg last protects the system. JMHO
bobby
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