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08-22-2011, 04:55 PM
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#1
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4 Rivet Member 
2004 16' International CCD
Arcata
, California
Join Date: Jul 2003
Posts: 250
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TV battery jumper to tongue jack.
I'm trying to make a jumper from the TV 7 pin to the tongue jack so I don't have to lug my 2 heavy 6 volt batteries to the storage lot just to bring my trailer home for maintenance. I bought a female 7 pen and hooked up wires to the aux and ground and spring clamps on the other end. No go. I put a volt meter on the TV 7 pen and get nothing out of any pen. I grounded to the TV and then went around the horn with the + lead. Nothing. With the trailer plugged in to the TV everything works fine. What am I missing? Jamie
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08-22-2011, 05:20 PM
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#2
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Rivet Master 
1961 24' Tradewind
1969 29' Ambassador
1970 21' Globetrotter
Jamestown
, Tennessee
Join Date: Jul 2008
Posts: 1,783
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the tongue jack normally runs off the charge line pin not the auxilairy pin. Sorry I don't remember the pin # or color off the top of my head
__________________
Rick Davis 1602 K8DOC
61 tradewind, plus a few others
13 Ram 2500 TD
99 Dodge TD 577K miles
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08-22-2011, 06:37 PM
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#3
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4 Rivet Member
2004 16' International CCD
Arcata
, California
Join Date: Jul 2003
Posts: 250
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My tongue jack runs straight off of the battery. I just want to use the truck battery during storage retrieval (I keep the batteries at home so I can keep them charged). I could use a long wire from the truck battery to the jack but was hoping to use less wire. Jamie
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08-22-2011, 06:51 PM
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#4
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Rivet Master
2009 27' FB Flying Cloud
1982 31' International
1991 35' Airstream 350
Jay
, Oklahoma
Join Date: Oct 2006
Posts: 1,706
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Looking at the back of the trailer side of a 7 way female plug, (meaning the screw terminals) 12 volt positive is the at 1 o'clock, and ground is at seven.
Follow the link, and scroll down the page to the 7 way diagram.
http://www.etrailer.com/faq-wiring.aspx
If you know which wires are positive and ground on the jack, you are good to go.
__________________
Jeff & Cindy
'09 27FB Flying Cloud;'82 31 International
'91 350 LE MH; '21 Interstate 24GT
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08-22-2011, 07:36 PM
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#5
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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7-way....
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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08-23-2011, 07:57 AM
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#6
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Site Team
2002 25' Safari
Dewey
, Arizona
Join Date: Mar 2005
Posts: 15,616
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Just plug in the cord from your truck and you should be fine. Remember that if you tow without a battery in the trailer, the breakaway feature will not work.
__________________
Richard
Wally Byam Airstream Club 7513
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08-23-2011, 07:33 PM
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#7
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4 Rivet Member
2004 16' International CCD
Arcata
, California
Join Date: Jul 2003
Posts: 250
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Good call on the breakaway. My rationalization is that I'm only going less than a mile and never over 25 MPH from storage to home. I don't even put on the extension mirrors or load leveling bars. As for just plugging in the cord, that doesn't work. The tongue jack is hooked up to the battery only. So there isn't a hot lead from the truck battery on the 7 pen? And if so, why won't it show on my volt meter? Jamie
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08-23-2011, 08:06 PM
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#8
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Rivet Master
Port Orchard
, Washington
Join Date: May 2009
Posts: 4,463
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Quote:
Originally Posted by azflycaster
Just plug in the cord from your truck and you should be fine. Remember that if you tow without a battery in the trailer, the breakaway feature will not work.
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Just be absolutely sure that both of the loose positive battery cable ends are securely isolated from ground before plugging in the truck. Other than that, this seems by far the simplest solution.
Ken
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08-23-2011, 08:26 PM
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#9
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Rivet Master
Currently Looking...
Sioux Falls
, South Dakota
Join Date: Jun 2010
Posts: 2,403
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Interesting thread. The jack on my trailer is connected directly to the hot battery charge line from the tow vehicle. The charge line is connected to the trailer battery. If my trailer battery is removed, the jack on my trailer is connected directly to the hot battery charge line from the tow vehicle.
Sidebar: I call electric jacks "stranded jacks". I'm replacing mine with a front handle sidewinder jack.
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08-23-2011, 09:10 PM
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#10
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Site Team
2002 25' Safari
Dewey
, Arizona
Join Date: Mar 2005
Posts: 15,616
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The "hot" line as you call it is the charge line to the trailer battery. In most TVs the key must be on to energize that line. In some TVs a fuse has to be added to the truck as well.
__________________
Richard
Wally Byam Airstream Club 7513
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08-24-2011, 05:26 AM
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#11
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Ken,
Richard brings up a good point. Do you know for sure that the "charge" line was ever live when unhooked?
Not sure how it's wired on your Ford, ours is fused and hot all the time.
Your FoMoCo manual should tell you.
Bob
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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08-26-2011, 10:02 AM
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#12
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4 Rivet Member
2004 16' International CCD
Arcata
, California
Join Date: Jul 2003
Posts: 250
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Bingo! for Richard in post #10. The answer to my whole problem was to have the truck ignition switch in the "on" position. Then everything works as I had hoped. I tried the acc. position initially but that didn't work. The longer I live, the more I learn. I think I'll need to live to 150 to lose my Knucklehead status. Thanks to all for your input. Jamie
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08-26-2011, 10:11 AM
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#13
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,711
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I was going to suggest using a bottle jack on a bunch of scrap wood to jack up the tongue if nothing else worked. Now I won't.
Gene
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08-26-2011, 10:18 AM
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#14
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4 Rivet Member
2004 16' International CCD
Arcata
, California
Join Date: Jul 2003
Posts: 250
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Gene, Not a bad idea as a backup for when things go wrong, electrically speaking. I have had the up/down switch corrode and not work. It's not that easy to crank up with the emergency crank. Jamie
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08-26-2011, 11:46 AM
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#15
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Jamie,
 I had to forget something this morning to make room for something Gene told me yesterday.....wish I could remember what it was.... 
Bob
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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08-26-2011, 01:13 PM
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#16
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,711
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Quote:
Originally Posted by ROBERT CROSS
Jamie,
I had to forget something this morning to make room for something Gene told me yesterday.....wish I could remember what it was....
Bob |
Bob, did you forget what I told you (his initials are RW and he's not the guy who settled RI), or forget what you forgot this morning?
Gene
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08-26-2011, 02:17 PM
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#17
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Gene,
No...I remember what I forgot this morning and now there's no more room to remember whatever you told me that I forgot. I may start over tomorrow.
Bob
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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