Battery isolator question??
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Fleet Mechanic
Joined: Jun 2015
Posts: 1,635
Likes: 564
Battery isolator question??
Needing to charge dual battery’s on my enclosed trailer. I realize the 7 pin hookup on the back of the truck has the capability to do this. But, it’s really more of a maintaining charge rather than full blown bring back battery’s from the dead kinda charge. Anyways, Im thinking of running a solenoid style isolator as opposed to a diode style isolator due to the voltage drop associated with diodes. Im gonna run 2/0 cable positive and negative leads to the back of the truck to really get some juice back there. My question is, does it matter where the isolator is installed relative to the truck battery’s? Meaning do I have to have the isolator as close to the truck battery’s as possible or can i install it in the trailer? I’m still going to run my 2/0 leads to the back of the truck and then build some 2/0 leads comin out of the trailer. Thanks
Laughing Gas
Joined: Oct 2016
Posts: 1,077
Likes: 93
From: DFW, Texas
Needing to charge dual battery’s on my enclosed trailer. I realize the 7 pin hookup on the back of the truck has the capability to do this. But, it’s really more of a maintaining charge rather than full blown bring back battery’s from the dead kinda charge. Anyways, Im thinking of running a solenoid style isolator as opposed to a diode style isolator due to the voltage drop associated with diodes. Im gonna run 2/0 cable positive and negative leads to the back of the truck to really get some juice back there. My question is, does it matter where the isolator is installed relative to the truck battery’s? Meaning do I have to have the isolator as close to the truck battery’s as possible or can i install it in the trailer? I’m still going to run my 2/0 leads to the back of the truck and then build some 2/0 leads comin out of the trailer. Thanks
I have it on my boat and it works GREAT. Once the truck batteries are charged, it send the extra charge to the trailer batteries. Once you turn the truck off, it will disconnect the trailer batteries.
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Fleet Mechanic
Joined: Jun 2015
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Postmaster
Joined: Jun 2014
Posts: 3,206
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From: Oakhust NJ Jersey Shore
I agree that an isolator robs voltage and a continuous duty solenoid would work. They can be installed anywhere without worry of voltage drop just make sure your 2/0 wire is fuse protected close to the batteries as a rub thru or short would take out your truck. It's hard to fuse a wire that heavy but it must be done. The marine industry does have alot of options you are looking for, they deal with this type of system more than the automotive end does. Hope this helps.
Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
there are some pretty knowledgeable guys here too. I wouldn't move this thread, just start a new one in towing.
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