Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: sticks <wolverine01@charter.net>
Newsgroups: rec.outdoors.rv-travel
Subject: Re: Charging from tow vehicle
Date: Fri, 21 Feb 2025 16:29:13 -0600
Organization: A noiseless patient Spider
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In-Reply-To: <slrnvrh4km.l4e.theise@panix2.panix.com>

On 2/21/2025 8:49 AM, Ted Heise wrote:
> Hi all,
> 
> Thinking of trading in my Acadia for a new one and the sales rep
> mentioned something about it having a larger alternator.  That
> make me just idly wonder if it's possible to get a factory
> installed system that would supply enough power at the 7-pin
> connector to recharge a LiIon battery while towing.

I am about 99.9% sure the answer to your question is no, Ted.
Still a good idea to get the big alternator, and maybe even a double 
battery setup.
The main problem is the wire size on the 7-pin plug.  On my TOAD, I 
installed a power plug so I could use a 12 Gauge wire that was always 
on, but that was only for trying to keep the battery on the TOAD up to 
run the braking system.  This would not be enough to charge depleted LI 
batteries.

What you need is very heavy gauge wire from the battery to the back of 
the tow vehicle with a plug for a DC-DC charger if you really want the 
tow vehicle to charge the trailer battery.

<https://www.youtube.com/watch?v=V_jHoEEkiUc>