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Old 06-29-2016, 03:18 PM   #11
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I don't think having both sources plugged is serious, until it is. I always unhook the 7 pin because I had a problem once and the trailer killed the truck battery. So now it is a standard procedure; hook to shore power and unhook the 7 pin, always.
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Old 06-29-2016, 03:44 PM   #12
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My Expedition has a relay which disconnects the 12v power from the trailer whenever the ignition is turned off, so theoretically there should be no 12v connection between vehicle and trailer when the ignition is off... Don't know if others are like this, or not..

That being said, I still always unplug the vehicle cord before connecting shore power, as a precaution.
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Old 06-29-2016, 06:26 PM   #13
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Two Connections

My truck lights flashed when I turn one of the outdoor spotlights on from inside the RV when I have the 7 Pin connected!
I think it's harmless but a little questionable too.
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Old 06-29-2016, 06:39 PM   #14
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I dont guess it hurts anything I have been doing it for years, and as I understand the truck electrical system there is no power on plug when key is off
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Old 06-29-2016, 08:01 PM   #15
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Agree with almost all comments. We have been RV'ing for more than 40 years. Our experience has shown that there are usually no serious consequences of leaving the 7-pin connector between tow vehicle and RV connected while your RV is on shore power. However, we almost always disconnect the 7-pin when our trailer is on shore power, whether we are home or at a camp site. We have witnessed situations where the camp site shore power went down in the middle of the night, and those whose RV's were still connected to the tow vehicle drained their TV batteries trying to keep up with current demand. I will always prefer to have my tow vehicle battery operable.
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Old 06-29-2016, 09:49 PM   #16
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I always look for the evidence of a problem to prove it is a problem. I've been on this forum now for several years and I've yet to see the post "Well dummy me, I've drained my batterie or burned up my TV. I should have listen to all you guys about leaving my TV connected while on shore power." . That is because I don't remember seeing any posts or warning to disconnect TV, nor does my TV manual warn me.

In my TV there is a relay that disconnects the 12v from the trailer when the key is off which will keep the RV from draining or using the TV battery. When the truck is on and the converter is on the and the truck is Connected to the TV it is not a problem. The battery is a current device and will draw current from both sources much like having two 12 volt batteries wired in parallel.

If your not sure is you have a relay then disconnect when parked but if you don't the converter will keep your TV battery charged also..
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Old 06-29-2016, 11:31 PM   #17
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I always look for the evidence of a problem to prove it is a problem. I've been on this forum now for several years and I've yet to see the post "Well dummy me, I've drained my batterie or burned up my TV. I should have listen to all you guys about leaving my TV connected while on shore power." . That is because I don't remember seeing any posts or warning to disconnect TV, nor does my TV manual warn me.

In my TV there is a relay that disconnects the 12v from the trailer when the key is off which will keep the RV from draining or using the TV battery. When the truck is on and the converter is on the and the truck is Connected to the TV it is not a problem. The battery is a current device and will draw current from both sources much like having two 12 volt batteries wired in parallel.

If your not sure is you have a relay then disconnect when parked but if you don't the converter will keep your TV battery charged also..
There's a couple of post in this thread from folks that had there batteries drained. I'm guessing the reason may be difference in the TV setup. The relay or whatever. One day I'll get my voltmeter out and find out how mine works while I'm in the driveway. I think most, like me, had rather err on the side of caution as being wrong could possibly leave one stranded.
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Old 06-29-2016, 11:50 PM   #18
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There's a couple of post in this thread from folks that had there batteries drained. I'm guessing the reason may be difference in the TV setup. The relay or whatever. One day I'll get my voltmeter out and find out how mine works while I'm in the driveway. I think most, like me, had rather err on the side of caution as being wrong could possibly leave one stranded.
I agree, better to be on safe side as far as battery drain goes, especially if your not connected to shore power.
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