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Old 10-13-2021, 03:25 PM   #1
Seasoned Camper
Join Date: Aug 2020
Location: Edinburg
Posts: 72
M.O.C. #26856
Battery wiring

I recently purchased a 2003 Montana 5th wheel. I think it has 2 jack Motors because the Jack's mover REALLY fast. Like 3 to 4 inches in 10 seconds. Anyway, the battery wiring confuses me and I hope someone can help. There is a lead acid non sealed battery and two Duracell agm batteries. The two Duracell are wired in parallel and then run to the negative on the lead acid. However!, non of the wires run to the positive on the lead acid. I am going to try to attach a picture.

The picture only shows one of the Duracell batteries, but the two are just neg to neg and pos to pos.
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dallasrules is offline   Reply With Quote
Old 10-13-2021, 05:17 PM   #2
Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,106
M.O.C. #13740
So with no positive wire on the lead acid battery, it is not being used at all. I assume that one of the wires on the negative terminal go to the chassis ground. And i assume that the positive wires on the agm batteries go to various connections for the trailer. My guess is that the former owner was not able to remove the lead acid battery for some reason. Without being there to really look around, this is the only conclusion i can come to.
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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Old 10-13-2021, 09:21 PM   #3
Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 6,229
M.O.C. #6433
I agree with above. That battery is doing nothing but taking up space and adding weight. Kept as a backup maybe?? May be dead if it hasn’t been charged in a long time.
Bill & Patricia

2007 3075RL
2012 F350 SRW CC LB FX4 6.7
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