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Old 09-12-2019, 02:16 PM   #1
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Disconnecting 12v charge current from tow vehicle?

Hey all,

2010 27FB, 2015 Ram 1500 here.

I just installed some pretty expensive lithium batteries, and I'm trying to determine if I can disconnect the 12v power coming from my 2015 Ram 1500. My assumption is that one of the other pins on the 7 pin connector is supplying power to the breaks, but I figured this would be the best place to ask.
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Old 09-12-2019, 02:32 PM   #2
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Diagram

Here you go.
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Old 09-12-2019, 03:03 PM   #3
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You may be able to just pull a fuse on your Ram. Check the manual for a fuse for trailer 12V or trailer charge, or something like that. After pulling the fuse, check to make sure your brakes still work. My F-150 had a fuse just for the charge line.

Another alternative is to find the charge line at your 27's DC panel and disconnect it.

Al
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Old 09-12-2019, 03:18 PM   #4
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Pull the fuse. Or install something like the Victron Cyrix-ct 12/24V-120 battery cmb. Good diagram at https://amsolar.com/rv-battery-accessories/98-altagmtow as you build your system.
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Old 09-12-2019, 07:46 PM   #5
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Disconnecting 12v charge current from tow vehicle?

^^^^

Yup pull the trailer aux fuse in your fuse box. My 2500 gmc had a 30A fuse dedicated to the aux charging line on the 7-way. I pulled to so as not to mix and match voltages across lead acid and lithium. Works like a charm and takes 15 seconds once you know which one. Just check your book.

If you go the victron route you need an Orion DC-DC converter. Just search “Orion” on the forum and you’ll pull up posts and I shared model number in the past....
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Old 09-12-2019, 07:51 PM   #6
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Missed the lithium bit. Here's the AMSolar setup for use with LiOn batteries. Does not require an Orion unit.


https://amsolar.com/rv-battery-accessories/98-altclitow
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Old 09-13-2019, 08:00 AM   #7
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You guys rock, thank you! I found the positive charge line where it tied into the positive bus bar under the bed. I disconnected that and we're in business .
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Old 09-13-2019, 08:02 AM   #8
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Quote:
Originally Posted by ghaynes755 View Post
Missed the lithium bit. Here's the AMSolar setup for use with LiOn batteries. Does not require an Orion unit.


https://amsolar.com/rv-battery-accessories/98-altclitow
So I looked into this a little bit ago, and I had interpreted the install as needing to run a new positive and negative line straight from the battery-- is that not the case? Don't the existing lines connect directly to the vehicles alternator?
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Old 09-13-2019, 08:38 AM   #9
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I just checked out AM Solar's diagram, and it looks like they're using Battleborn drop-in replacements. Those batteries have an internal BMS that regulates voltage going into the cells, enabling them to take current straight from the alternator, whereas I have raw LiFePo4 cells with no BMS, so I would need something like the Cyrix to regulate voltage. (I think)
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Old 09-13-2019, 08:48 AM   #10
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get a battery isolator between the TV and AS.

we use a victron converter/inverter to chnarge our lion from AC/solar. we tell it we have BB lion battery and program the correct parameters as given by BB.

it works like a charm
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Old 09-13-2019, 09:55 AM   #11
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Hi

If you are running a lithium setup that does *not* have a BMS ... yikes ..... that's not a good idea at all.

Even with a BMS, you need to do something about the alternator. It's set up to charge a lead acid chassis battery. Dropping a lithium across a lead acid (which is what the charge line is doing) means that one or the other is not getting what it should. Either you nuke the lithium or the lead acid.

Best bet is to spend $80 on a DC/DC converter. Set it at 13.4V and forget about it.

Bob
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Old 09-13-2019, 11:44 AM   #12
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Quote:
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If you are running a lithium setup that does *not* have a BMS ... yikes ..... that's not a good idea at all.
!!

RIP your very expensive batteries...
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Old 09-14-2019, 08:26 PM   #13
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I would NEVER do a long term fix on the TV, any long term fix should be on the trailer side.

What happens if you break down and need to have someone else tow your trailer?

Destroyed batteries, maybe even with telling them it's needed.
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Old 09-15-2019, 08:29 AM   #14
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Disconnecting 12v charge current from tow vehicle?

Quote:
Originally Posted by Ksears View Post
I just checked out AM Solar's diagram, and it looks like they're using Battleborn drop-in replacements. Those batteries have an internal BMS that regulates voltage going into the cells, enabling them to take current straight from the alternator, whereas I have raw LiFePo4 cells with no BMS, so I would need something like the Cyrix to regulate voltage. (I think)


You need a victron Orion dc-dc converter to regulate voltage per post #5....
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