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Old 12-22-2014, 05:12 PM   #11
TGR
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I've heard advice given by several people to disconnect the tow vehicle from the trailer when camping without shore power to conserve your vehicle's battery but, as advised by a couple of people in this message string, your truck battery is not connected to your trailer. Instead, your alternator output feeds your trailer only when the truck is running. Your trailer can't drain your truck battery, nor can it help start your truck. Providing shore power to your trailer while hooked to your truck will not harm your truck.


I imagine some vehicles without factory wiring to supply power to charge the trailer could be wired by someone to go directly from the battery to the trailer but neither the manufacturer or an RV dealer would wire things that way. An RV dealer, etc., would use a battery isolator (relay or diodes) to keep the batteries isolated.


If the truck is factory wired to support the standard 7-pin vehicle to trailer plug, your all set.
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Old 12-22-2014, 07:17 PM   #12
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Radio asked why I wanted to have both connected. It's for heat! I want to get up early and pull the AC plug, get in the truck and drive away without waking up my sleeping neighbors.
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Old 12-22-2014, 07:23 PM   #13
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your truck battery is not connected to your trailer. Instead, your alternator output feeds your trailer only when the truck is running.
Yes.. that is correct. And only when you have the appropriate relays. So no issues whatsoever keeping your 7 pin plugged in for an early start in the morning. The OP is good to go!

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Old 12-22-2014, 07:47 PM   #14
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Without fail ! ! !! the very last thing I do before getting in the truck to leave is DO A QUICK WALK AROUND !! ! Can save some major issues
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Old 12-23-2014, 03:10 AM   #15
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Without fail ! ! !! the very last thing I do before getting in the truck to leave is DO A QUICK WALK AROUND !! ! Can save some major issues
X2 Always do a good walk around before you leave.
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Old 12-24-2014, 07:09 AM   #16
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My real concern is whether the trailer 12v appliances would draw down the truck battery to where I wouldn't be able to leave at all. I don't even know if the truck battery powers anything other than the lights.
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Old 12-25-2014, 09:43 AM   #17
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My real concern is whether the trailer 12v appliances would draw down the truck battery to where I wouldn't be able to leave at all. I don't even know if the truck battery powers anything other than the lights.
As others have mentioned, all modern trucks from the big three disconnect the charge line in your seven way RV plug from the trucks battery when the key is off so it would be impossible to run down your trucks battery through trailer 12V usage. So, by shutting off the key, you are essentially disconnected from the trailer other than the driving light circuits. ( exterior parking, turning, and brake)
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Old 12-25-2014, 10:13 AM   #18
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I'm always paranoid about leaving my truck and trailer connected because my dealer told me the trailer will drain the truck battery if I left it connected. (Not sure how fast it, actually, would and if that only means when dry-camping.)

But I did hear if your truck battery is dead, you can connect the camper and, supposedly, can get enough juice to start the truck...also not something I've tested!
Find a new dealer for advice
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Old 12-25-2014, 10:21 AM   #19
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Find a new dealer for advice
Agreed. The reverse charging to the truck trick wouldn't play either as it's only a 30 amp circuit for the battery charge line.
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Old 12-25-2014, 11:32 AM   #20
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Leave a sticky note on steering wheel - "UNPLUG CORD"
Got this tip from a friend of mine. Put an old golf club driver cover over the shifter handle, prompting you to do your pre-flight check list, which you have previously prepared and is handy at your fingertips, then your off!
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