Trailer Plug
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Senior User
Joined: Dec 2004
Posts: 307
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Trailer Plug
I dont know if this is the same for other super duties. When I plug in my trailer to my truck, I have to leave the key in the ignition in the accesory positon to get any power to the trailer. Is there anyway to rewire the plug so the I can get power to the trailer with out doing that? My dads dodge is like that and I find it alot more convenient. Any ideas?
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Are you talking about a power wire for running a light or something in the trailer? The tail lamps and flasher should work with the key off. If you're just looking for a power wire you could trace it and run it to your battery through a fusible link.
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
They do it that way so you don'tkill the battery with the trailer. Typically that wire is used to charge the trailer batteries, so it would kill the truck when the engine wasn't running.
Without knowing the year of your truck can't tell you which wire. They changed signifigantly year to year.
Without knowing the year of your truck can't tell you which wire. They changed signifigantly year to year.
Postmaster
Joined: Jan 2005
Posts: 4,743
Likes: 3
From: Peoria, IL
Check your manual for the trailer tow charge relay. Pull the relay and put a piece of wire between the #30 and #87 terminals. This will make the trailer tow battery wire hot all the time. Be advised that this will allow the trailer to drain your truck battery and may kill them prematurely.
Post Fiend
Joined: Feb 2007
Posts: 7,191
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From: Blairsville,Ga
Originally Posted by Beerstalker
Check your manual for the trailer tow charge relay. Pull the relay and put a piece of wire between the #30 and #87 terminals. This will make the trailer tow battery wire hot all the time. Be advised that this will allow the trailer to drain your truck battery and may kill them prematurely.
done a similar setup on my older trucks for feeds to winch,lift,etc
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FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
Another alternative is to put a small 12V battery in the circuit on your trailer. A gel cell would work well. That way you'd have lights without modifying your truck, plus your truck would chage the battery while you drive.
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Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
Definitely make sure it is a deep cycle battery if you do add a battery to the trailer! 
Beerstalker, great idea. Makes a really easy modification to do that, either way jumpered or switched and jumpered!
Beerstalker, great idea. Makes a really easy modification to do that, either way jumpered or switched and jumpered!
