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Old 07-21-2011, 07:11 AM   #11
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KyDan's Avatar
Join Date: Mar 2008
Location: Louisville, KY
Posts: 7,117
Originally Posted by Terier View Post
I was told to unplug it from the truck if I stay hitched at the CG otherwise it could over charge the truck battery.
Think about it...... if the charger in your trailer won't over charge
your trailer batteries why would it over charge your truck battery???

There's probably no good reason to leave your truck plugged into the
trailer while camping so I say unplug it.
But it's the same as the original question-- the battery closest to the
charger is going to get the most charge.

Of course if you have a newer Ford and maybe some others with the isolation
relay that disconnects the battery from the RV plug when the engine is off
charging or discharging the engine battery via the trailer connection is
not going to happen.

When we're dry camping---
OTOH if I want to use my truck battery as an extra boost sometime I'm
glad I can plug in and get the extra power.
I gave the example of needing a few more hours of juice to run my furnace
on a cold fall camping trip.
Another example is I watch a little TV using a cigarette socket inverter.
The TV is fussy about voltage and will shut off if the voltage is the
slightest bit low. We have to shut off the water pump when
we're watching TV because every time the water pump cycles it shuts
off the TV

Occasionally I've been known to plug in the truck to get that little bit
extra needed to keep the TV on. I usually unplug the truck when we
get done watching the TV.
Much of this was back when we had just a single 12v battery on the trailer.
We now have dual 12v on the trailer and I don't need the truck boost very

Dan & Rita D
2017 Nissan Titan 5.6L King cab 4wd
1999 Suzuki Intruder Motorcycle
Blue Ox WD hitch

Camping days 2010-53, 2011-47, 2012-41,
2013-41, 2014-31, 2015-40, 2016-44, 2017-63, 2018-30
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Old 07-21-2011, 07:50 AM   #12
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jimh's Avatar
Join Date: Jul 2010
Location: Lake Charles, La.
Posts: 1,535

i'm fairly certain that the ford disconnects when not running.
i would compare the charging to using a battery charger. the wire size isn't going to play a significant part in is large enough. if ur battery is low enough to require 30 amps charging, u will blow the fuze in the truck.

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