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Old 04-14-2015, 10:41 AM   #15
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Originally Posted by dznf0g View Post
This may not be true for all TVs. I am unaware of any GM vehicle that has more than a fuse in the line.

But, I just thought of something. Our products have battery rundown protection which shuts down unintended draws after 20 minutes of ignition off, or so. I'll have to check if the trailer charge line is a "protected" circuit or not.
My 1997 K2500 with the "camper prep" option had a large relay that did this. It appeared on the wiring diagrams so I believe it was stock. They were prone to contact failure, and after replacing mine a couple of times I got the sure power one which has worked out better.
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Old 04-14-2015, 10:43 AM   #16
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I just looked it up (for Silverado) Battery rundown protection covers interior lighting only. Headlamps are on their own timer.

And it's 10 minutes.

Jammer, I don't think they've been there for years. I'll just have to get out my multi-meter and check.
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Old 04-14-2015, 10:59 AM   #17
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Originally Posted by Jammer View Post
My 1997 K2500 with the "camper prep" option had a large relay that did this. It appeared on the wiring diagrams so I believe it was stock. They were prone to contact failure, and after replacing mine a couple of times I got the sure power one which has worked out better.
The only reference in the service manual is a relay for an additional auxiliary battery option (typically for slide in camper wiring provisions).

Edit: I just went out to the 2015 Sierra and there is 12v power at the charge terminal of the umbilical connector at all times.
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Old 04-14-2015, 11:11 AM   #18
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I did a post sometime back on an Atkinson relay and I installed one in my Chevy. http://www.airforums.com/forums/f449...light=Atkinson

Larry
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Old 04-14-2015, 11:24 AM   #19
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When staying hooked up overnight - as we often do when traveling - I have often wondered if, with the umbilical cord left in place and the trailer on 110v, if there is any way the 12V line from the trailer to the truck could cause any electrical problem with the truck - all those sensitive computers & such.

So I generally unplug the connecting cable - although there have been times when i have forgotten, and with no apparent ill effect, so I guess there is no issue.

Probably just ensures that the TV battery (or in our case two TV batteries) are well charged up!

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Old 04-14-2015, 11:31 AM   #20
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Brian, not in GM's case. The 12V power line is a straight circuit (describing upstream or backwards) from the umbilical connector to a stud on the underhood fuseblock, through a 30 amp fuse, to the alternator/battery positive stud on the fuseblock. In other words, it's just raw generated and stored 12V power, not passing through any electronic modules and such.
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Old 04-14-2015, 12:07 PM   #21
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I have left the umbilical connected for weeks at a time without the tow vehicle battery draining.
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Old 04-14-2015, 01:00 PM   #22
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Minno has it just right. If you don't need the tow vehicle to go elsewhere and you are level enough with it attached, it's so nice to have one less thing to do upon arrival and departure.

And DO unfasten the umbilical. Before heading to Texas from Southern California in our new 2009 28' International, we did a shakedown cruise to dry camp on the beach at Lake Isabella outside of Bakersfield. In February, it was chilly at 2600 ft--about 25 degrees--so we ran the furnace cycling on and off all night. We woke to a beautiful light frosting--and a completely dead battery on the Suburban. We couldn't believe that there wasn't an automatic shutoff of flow from the TV's battery--but there wasn't!

We've upgraded out battery bank from the two factory supplied 12v's to four 6v for a total of 440 amps (of which we don't use more than 50%), added more solar panels and a proper converter, and haven't had a problem since. But every time we stop for the night, the first thing we do is manually disconnect the umbilical! We've only forgotten to re-attach once, fortunately. Unfortunately, that was while climbing from Santa Fe to Telluride--I'm very glad that the Sprinter oversized brakes combined with low gears were able to handle our entire rig on some of those very steep, very long downslopes. I pulled over after one particularly long one and discovered the unattached umbilical--so no brake lights, but more importantly, no trailer brakes either!

Checklists are good.... :-)
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Old 04-14-2015, 02:49 PM   #23
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I'm thinking there is no draw on my Toyota's battery unless the switch is on-
If the coach batteries are dead, the tongue jack will not work until I start the truck.
It's like the cigarette lighters. Domestic makes- the cigarette lighter will work even if the key is not in the switch-
Asian makes- you have to turn the switch on to use the cigarette lighter-
I have left the umbilical plugged in for weeks at a time- truck still starts right away-


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Old 04-14-2015, 03:01 PM   #24
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Originally Posted by m.hony View Post
I'm thinking there is no draw on my Toyota's battery unless the switch is on-
If the coach batteries are dead, the tongue jack will not work until I start the truck.
It's like the cigarette lighters. Domestic makes- the cigarette lighter will work even if the key is not in the switch-
Asian makes- you have to turn the switch on to use the cigarette lighter-
I have left the umbilical plugged in for weeks at a time- truck still starts right away-


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Cigarette lighter....? We don't have those anymore, unless you ORDER a "smokers' package!

They're all "power ports" and won't accept the pop-out lighter. We have some of the ports ignition controlled and some not. There's 4 in my truck and 1 is hot all the time.
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Old 04-14-2015, 09:23 PM   #25
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OK-
12 volt power port-
Same difference-


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Old 04-14-2015, 09:26 PM   #26
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Point is-
No power is going through my umbilical unless the ignition switch is on-
I have the "smoker's package". It is a pop-out lighter and an ash tray that fits in one of the cupholders.


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Old 04-17-2015, 07:37 PM   #27
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I always unplug from my truck, why gamble on a discharged battery & their is no upside to staying connected. In the morning you attach the umbilical & go.
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Old 04-18-2015, 11:55 AM   #28
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I'm with you. I always unplug when I stay hooked up. I've always been afraid that when the trailer is powered by 110, some freak situation could put 110 into the tow vehicle and do some damage.

Even if it is not really possible, it just makes me feel better.

Brian
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