Power draw from tv battery when turned off - Page 2 - Fiberglass RV


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Old 06-02-2013, 09:38 PM   #15
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I like the KISS principle and just unplug the trailer from the tow vehicle when camping.
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Old 06-02-2013, 09:59 PM   #16
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Originally Posted by Brian B-P View Post
Good find!

They use more pins, but not that many. The old system uses two 7-pin connectors (the "12N" and "12S", not named for the number of pins), and the new scheme uses one 13-pin.
::doh:: brain fart! Fingers type faster the brain could keep up. You're right of course.

Two 7pin plugs and the second one is not fully utilized. Also there is some duplication with several ground leads and such.

I may have mixed up the wiring because I found more info on semis than rv 12s and 12n plugs.

Jason
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Old 06-02-2013, 10:10 PM   #17
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Originally Posted by Bruce H View Post
If your tow vehicle is a GM product with factory trailer plug, yes your trailer will drain your TV battery unless you unplug the trailer when stopped. I had a 2006 Chevy pickup that would anyway. More than once I forgot to plug it back in when I started out the next day. Late model Ford pickups with factory trailer wiring disconnect the "hot post" in the trailer plug when you shut the key off so no problem.
I have been told that Dodge and GM are the only two that leave that wire hot all the time, but I'm not certain on that. I know my on my Nissan, the wire is dead when the truck key is off.
EDIT: actually, on thinking about it, on the Nissan it is likely isolated thru the "CAN" that runs that part of the wiring. Many modern vehicles have CANBUS, so that actually makes some of that type of control simpler and more reliable ( if you are willing to call CAN "simple" ).
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Old 06-02-2013, 10:13 PM   #18
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Originally Posted by David B. View Post
I like the KISS principle and just unplug the trailer from the tow vehicle when camping.
What if some doofus pulls the pin from your brake-away switch while you are in having lunch? It seem to me that, if you eat enough food, your battery will be dead by the time you are ready to drive away.

Derek


PPS My original trailer did not come with a "house" battery. Instead, everything ran off the tow vehicle. This is the simplest option. If you tow behind a '70s VW beetle, the battery is unnecessary anyway. if your battery is dead you can start it by pushing it. This is true KISS principle.
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Old 06-02-2013, 10:25 PM   #19
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Where do you guys travel that there are teenagers running around looking for trailers that they can mess with?
Could it be that these issues with wiring etc. are owner error?
MeThinks.
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Old 06-02-2013, 10:53 PM   #20
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Originally Posted by Glenn Baglo View Post
Where do you guys travel that there are teenagers running around looking for trailers that they can mess with?
Could it be that these issues with wiring etc. are owner error?
MeThinks.
Some take the hypothetical situations a little too seriously me thinks.

Seriously though, a swift yank on the brake away switch cable is all it takes.

Derek
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Old 06-02-2013, 10:57 PM   #21
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Originally Posted by Brian B-P View Post
I think that's a valid point, but I think I'm less reliable than a simple relay, so personally I would rather run the small risk of the relay failing (which I can bypass on the roadside with a pair of pliers) than the large risk that I park the rig for something like a meal stop with the refrigerator on and forget to unplug... or worse, unplug and forget to plug back in when I pull away.

I understand your point.
However, some of us never use the fridge on 12V, therefore unplugging when stopping for 30 minutes to a couple hours won't matter. Even using the fridge on 12 V it would take 4+ hours to run down the batteries.
So it still seems like a non issue.

If, however, you're still concerned then the relay or solenoid is the way to go.
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Old 06-02-2013, 11:15 PM   #22
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Some take the hypothetical situations a little too seriously me thinks.

Seriously though, a swift yank on the brake away switch cable is all it takes.

Derek
The kids are all on wireless. They don't have a clue.
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Old 06-03-2013, 12:40 AM   #23
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Originally Posted by glamourpets View Post
Some take the hypothetical situations a little too seriously me thinks.

Seriously though, a swift yank on the brake away switch cable is all it takes.

Derek

Brake currents
Brake Size Amps/Magnet
7 x 1-1/4 inches 2.5
10 x 1-1/2 inches 2.5
10 x 2-1/4 inches 3.0
12 x 2 inches 3.0


At 2.5 amps for wheel (magnet) that only 5 amps on my trailer.

One should always do a walk around after leaving the trailer for even 15 minutes. Look at the cables, safety chains, the break away switch, etc. It only takes a couple seconds and can save you lots of headaches.
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Old 06-03-2013, 01:00 AM   #24
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One should always do a walk around after leaving the trailer for even 15 minutes. Look at the cables, safety chains, the break away switch, etc. It only takes a couple seconds and can save you lots of headaches.[/QUOTE]

Two thumbs up, and more, if I had more thumbs. I do the walk around every time I stop and before I go.
Makes a lot more sense than blaming somebody else. I'm trying to imagine roving bands of teens that know what a break-away switch is, and then making the effort to disconnect it. Half the people on this site either don't have brakes or don't know what a break-away switch is, what it looks like or where it is.
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Old 06-03-2013, 07:28 AM   #25
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I have been told that Dodge and GM are the only two that leave that wire hot all the time, but I'm not certain on that.
My 2005 Ram 1500 with a factory tow package does not provide power with the key off. They may have changed at some point, Chrysler engineers live by the motto "If it ain't broke, fix it till it is!". Maybe someday they'll redesign the fenders to stop the "Dodge Rot", likely they'll just sell them pre-rusted like the Volare and Aspen.
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Old 06-03-2013, 07:53 AM   #26
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Originally Posted by Glenn Baglo View Post
One should always do a walk around after leaving the trailer for even 15 minutes. Look at the cables, safety chains, the break away switch, etc. It only takes a couple seconds and can save you lots of headaches.

Two thumbs up, and more, if I had more thumbs. I do the walk around every time I stop and before I go.
Makes a lot more sense than blaming somebody else. I'm trying to imagine roving bands of teens that know what a break-away switch is, and then making the effort to disconnect it. Half the people on this site either don'
I took a truck driving course years ago. The instructor warned me to always lock your 5th wheel otherwise kids will pull the pin when you stop at a red light. When the light goes green, you will drive away but your cargo will remain behind. Apparently this is an issue in high crime neighborhoods. Commercial trucking has real problems with cargo theft, and this is an easy way to take over a truck and cargo.

Are people likely to do evil to our trailers and tow vehicles? Likely not, but thinking ahead is a good plan. Its pretty easy for an evil doer to disconnect stuff, even if they really don't know what its for.

Derek
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Old 06-03-2013, 08:03 AM   #27
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Originally Posted by Thomas G. View Post

Who knew? There seem to be a number of these sold.

Amazon.com: voltage sensitive relay
Yeah, I tried google search and Amazon. I couldn't find anything that was made for what I wanted to do, nor anything reasonable in price. The harness they sell, in UK for cars, is $30-40 I believe.

Believe me, had I found a simple relay, locally (no need for customs) for the cause I would have jumped all over. I still want that harness but "momma" has the purse string for my crazy projects.

Jason
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Old 06-03-2013, 08:57 AM   #28
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'05 Yote with factory tow package, 4 pin is hot only with ignition on.

jack
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