Trailer plug question
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Fleet Mechanic
Joined: Mar 2006
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Trailer plug question
7 pin connector on a 2008 F-350
I need to make my trailer hot all the time cause I want to put emergency lights on the back for when I'm parked doing a job.
What wire is switched with the key ?
Plan on a line off battery with a 15a fuse in line back to the connector. I just don't know what pin to go to
Matt
I need to make my trailer hot all the time cause I want to put emergency lights on the back for when I'm parked doing a job.
What wire is switched with the key ?
Plan on a line off battery with a 15a fuse in line back to the connector. I just don't know what pin to go to
Matt
Go Bills !
Joined: Jan 2008
Posts: 2,778
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From: Buffalo, NY
https://images.search.yahoo.com/sear...f&action=close
Every time I work on connectors, I go to yahoo, Type in 7 flat wire diagram, click images. A wealth of pictures to pull up with diagrams.
You may have already a hot wire back there on the connector, You trailer just might not be wired for it, There might be a wire there to charge the battery for the emergency battery .
Every time I work on connectors, I go to yahoo, Type in 7 flat wire diagram, click images. A wealth of pictures to pull up with diagrams.
You may have already a hot wire back there on the connector, You trailer just might not be wired for it, There might be a wire there to charge the battery for the emergency battery .
Postmaster
Joined: Jul 2015
Posts: 4,392
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From: very South Texas
as above.. Ford, the power is only there with the KEY ON....
its called "Trailer Charge" line. for charging a trailer battery. but can be used for many things... also. it is limited to 20 amps... MAX
its called "Trailer Charge" line. for charging a trailer battery. but can be used for many things... also. it is limited to 20 amps... MAX
Cargo Master
Joined: Jul 2003
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Honestly, I wouldn't want my emergency strobes wired into the key because then you have all the other acc. powered up too. My tandem dump trk has the beacon lights wired to the key and I have to manually turn off the radio, fan, etc.. so they don't run also. It would be nice to just shut the truck off and flip the switch to run the strobes.
Fleet Owner
Joined: Mar 2003
Posts: 24,724
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From: Blue Hill Township
Best bet is to put a battery in the trailer. Sure would suck to run the truck down because the trailer is hooked up
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Fleet Mechanic
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Honestly, I wouldn't want my emergency strobes wired into the key because then you have all the other acc. powered up too. My tandem dump trk has the beacon lights wired to the key and I have to manually turn off the radio, fan, etc.. so they don't run also. It would be nice to just shut the truck off and flip the switch to run the strobes.
Matt
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Logistics Pro
Joined: Mar 2005
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From: southeast PA
You can do this without rewiring anything. All you need to do is remove trailer battery charge relay and jump pins 30 and 87. Done. My truck was like that for 2 years, installed the jumper the day I drove it home new. Sold that trailer and now have the relay back in. Don't let anyone tell you it's a bad idea because Ford is the only brand that switches the trailer charge wire.
Logistics Pro
Joined: Mar 2005
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From: southeast PA
No pics. Don't know if the fuse box on a 13 and 08 would be the same anyway. If you can run a new fused wire you can locate and jump out a relay. The pinout should be labeled in its base.
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Apr 7, 2008 10:26 AM