12 volt supply line on round plug?
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Junior User
Joined: Feb 2005
Posts: 61
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From: michigan
12 volt supply line on round plug?
I have a 2004 F150 5.4L...I want to be able to run my 12 volt lights in my camper thru the trailer light Round plug is it possible? i have heard on GMC's that there is a wire that needs to be hooked to the battery to make this possible. Are our Fords the same way? Please help, thanks in advance!
Junior User
Joined: Dec 2006
Posts: 52
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From: Arkansas
If you have the factory tow package everything is already there. There is a relay that comes with the brake controler pigtail. The relay should plug in on the right side kick panel of the truck under the dash. I believe the wire is only hot while the key is on to prevent draining of the vehicle battery.
Freshman User
Joined: Mar 2007
Posts: 25
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The relay is only used for providing a charge to the trailer's battery. Your trailer's tail lights should work by just plugging in the trailer's 7-pin connector. If they're not working, you should check your fuses.
Don
Don
