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Old 12-20-2015, 10:05 AM   #15
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We didn't want the tow vehicle to charge our TT batteries so we just pulled the fuse in the truck that is dedicated to this circuit.
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Old 12-20-2015, 10:47 AM   #16
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We replaced the factory #14 gage charge line with #10 wire from one of the two batteries through a 30 amp circuit breaker and then to the seven way plug. We did the same for the brake system power.

When we installed the Lifeline batteries, we disabled the battery charge wiring inside the coach to the batteries so we would not cook the batteries. This was especially important for the Lithium battery as well.
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Old 12-20-2015, 12:51 PM   #17
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The factory system on our 2015 27' FC keeps our batteries up in fine form. If we use the lights, tvs, fans, etc and draw the batteries down to ~40 percent the solar has them recharged before 11 in the morning. We are very happy with the factory solar and are very glad we made the decision to add that option. Happy trails!
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Old 12-20-2015, 01:11 PM   #18
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Agree with Bold Adventure. One of our friends drained the battery by running his furnace all night in a Truck Stop. I commented that he was lucky he didn't kill the truck battery. He had at least thought far enough ahead to disconnect the trailer plug.
One advantage to the direct connect is being able to jack up the trailer with a dead house battery, or in winter with house batteries out of the trailer. The other is knowing exactly what wiring is feeding the trailer. If it went through a route controlled by the ignition, you would have no idea what wiring sizes and computer connections are involved.
Every trailer I have had was (is) directly connected to the TV battery positive post with a 30 amp fuse right at the post. In winter I pull the fuse to stop leakage current from deteriorating the 7 pin connector. I also pull the fuse on the brake controls. Since I have been doing that I never have a problem with corroded connections in the spring.

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Old 12-21-2015, 08:56 AM   #19
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Originally Posted by JCWDCW View Post
One advantage to the direct connect is being able to jack up the trailer with a dead house battery, or in winter with house batteries out of the trailer.
JCW

We have taken advantage of this exact scenario on two occasions. We're like, "OMG, the battery is dead, I so don't want to jack the trailer with that that ridiculous manual crank," followed by the realization that connecting the umbilical to the truck while it's running provides plenty of power to the trailer jack so we can hitch up and get going anyway.

We've not checked to see whether our RAM 1500 provides power to the umbilical when the ignition is off, but we'll take folks' word for that and be careful. Thanks for that tip!
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Old 12-21-2015, 01:56 PM   #20
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Yes it does :-)
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Old 12-21-2015, 06:53 PM   #21
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Our installed solar system charges at a much higher rate when underway than the truck could alternator could provide over the factory #14 gage wiring.
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Old 12-21-2015, 10:31 PM   #22
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We've not checked to see whether our RAM 1500 provides power to the umbilical when the ignition is off, but we'll take folks' word for that and be careful. Thanks for that tip!
My 2010 does.
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Old 12-22-2015, 06:19 AM   #23
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We've not checked to see whether our RAM 1500 provides power to the umbilical when the ignition is off, but we'll take folks' word for that and be careful. Thanks for that tip![/QUOTE]


Our 03 2500 certainly does , in fact we always leave the pigtail plugged into the truck when camped with no source of out side power as it provides an abundant amount of 12 volt power with the two very large batteries that the truck has under the hood .

Have done this many many times and have never had an issue with starting the truck the next day . But if that were to happen , a pull on the rope of the 3500 watt generator engine would have things ready to roll in short order .
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Old 12-27-2015, 12:17 PM   #24
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I currently have a small trailer that when driving will charge the battery. If you are concerned about running down your tow vehicle you can purchase a battery isolator that can be placed in your tow vehicle or wired into your trailer. When the tow vehicle is off it prevents the trailer from draining your tow vehicle battery.

If you want to save money just unplug from the tow vehicle while camping.

Dave
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Old 12-27-2015, 01:11 PM   #25
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With two alternators, if you run an 8 or 10 ga wire all the way, it should charge the crap out of your battery...


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