Trailer wiring Harness?
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Freshman User
Joined: Nov 2004
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From: Clovis, Ca
Trailer wiring Harness?
On the F250 there is a plug in the back to either plug in a OEM 4 flat trailer harness or a 7 round trailer harness. Question is that can I cut off the OEM square plug and hard wire a 7 round trail harness. The OEM is hard to get and is very expensive.
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18 views and no respons is because we don't really understand the question.
You might get better luck down in the tow/haul forum also.
what OEM is hard to get and expensive? You can wire an entire trailer for 4 flat for less than $19 at auto zone or wally world. The adapters to convet 4, 5, 6 on a trailer to 4 or 7 on the truck are all less than $9.
Tell us what your trailer wireing is, what you want to do and we can take a stab at it. The rear 7 pin plug on your ???year ??? configuration F250 is only hot after pluging in some relays for the lights, and only hot for electric brakes after installing a trailer brake controller. The 4 pin receptical is always hot for lights.
You might get better luck down in the tow/haul forum also.
what OEM is hard to get and expensive? You can wire an entire trailer for 4 flat for less than $19 at auto zone or wally world. The adapters to convet 4, 5, 6 on a trailer to 4 or 7 on the truck are all less than $9.
Tell us what your trailer wireing is, what you want to do and we can take a stab at it. The rear 7 pin plug on your ???year ??? configuration F250 is only hot after pluging in some relays for the lights, and only hot for electric brakes after installing a trailer brake controller. The 4 pin receptical is always hot for lights.
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Freshman User
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From: Clovis, Ca
Ford has an OEM tow package wiring. http://www.hitchfinder.com/drawtite/electrical/wiring_harnesses.htm
Here is a web site that shows you the OEM 7 round tow package wiring harnnes.
Know all you have to do is mount the 7 round connector adaptor to your rear bumper & plug the square plug into the trucks trailer wiring harness that Ford has provided.
The question is can I cut the square reciever connector that FORD has privided on the truck & hard wire in a 7 way round connector adaptor that you can get @ auto zone.
Here is a web site that shows you the OEM 7 round tow package wiring harnnes.
Know all you have to do is mount the 7 round connector adaptor to your rear bumper & plug the square plug into the trucks trailer wiring harness that Ford has provided.
The question is can I cut the square reciever connector that FORD has privided on the truck & hard wire in a 7 way round connector adaptor that you can get @ auto zone.
Last edited by j4rdemotox; Jan 9, 2005 at 01:08 PM.
Cargo Master
Joined: Apr 2003
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From: Too close to Houston
Originally Posted by j4rdemotox
The question is can I cut the square reciever connector that FORD has privided on the truck & hard wire in a 7 way round connector adaptor that you can get @ auto zone.
Mountain Pass
Joined: Jan 2004
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From: Ixonia, WI
On my 99 SD I just had the 4-way flat plug and needed the seven. I Found a OEM Ford seven way round plug and harnes like the one on the web sight at the local swap meet for $20 in great condition. I did just unplug the 4-way flat up in the frame in back and pluged in the 7-way that I bought. Then I installed two 30A relays that I also got from the guy I bought the plug from in the location up by the master cylinder under the hood. Then I installed a brake controller, I went to Ford and bought the little factory harness to wire in the controller under the dash($13) (kind of a pain to find the little plug under the dash to plug the controller harness in to). Then I just hard wired and solderd my 4-way flat plug into the 7-way harness in back. Now I have both and it wasn't too difficult, just takes some time. good luck
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j4rdemotox
Yes you can but pleas tell us what truck, what trailer, and why.
If you need to adapt the 4 plug Ford to a trailer 7 plug then that suggest that your trailer has Electric Brakes and additional battery charging circuit.
I am telling you thae there are 30 different adapters out there and one is a plug to 4 flat that leave you with a round 7 to plug the trailer into... Hard wireing one by cuting off the Ford truck 4 flat is a bad idea.... hard wireing by leaving the 4 flat and "adding" the 7 round is doable but either way you will NOT have electric brakes or 12VDC hot to the trailer battery charge circuit.
If you need complete 7 round (or 5 round) to activate electric trailer brakes then you MUST add the complete harness, some relays, and a trailer brake controller to the Ford truck.
All the flat 4 provides is Brake LIGHTS, Running Light, Turn Signals L+R, and Ground. There is not enough juice in those sized wires to run anything else.
Yes you can but pleas tell us what truck, what trailer, and why.
If you need to adapt the 4 plug Ford to a trailer 7 plug then that suggest that your trailer has Electric Brakes and additional battery charging circuit.
I am telling you thae there are 30 different adapters out there and one is a plug to 4 flat that leave you with a round 7 to plug the trailer into... Hard wireing one by cuting off the Ford truck 4 flat is a bad idea.... hard wireing by leaving the 4 flat and "adding" the 7 round is doable but either way you will NOT have electric brakes or 12VDC hot to the trailer battery charge circuit.
If you need complete 7 round (or 5 round) to activate electric trailer brakes then you MUST add the complete harness, some relays, and a trailer brake controller to the Ford truck.
All the flat 4 provides is Brake LIGHTS, Running Light, Turn Signals L+R, and Ground. There is not enough juice in those sized wires to run anything else.
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From: Potosi
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From: Clovis, Ca
My other Ford trucks came with them, but not this truck. Then again I always make sure that my truck come with the tow package. However I purchased this truck used & it did not have the tow package on it. The up side to it this is that they never towed anything with this truck.
My truck is an F250 SD Lariat 4X4. It has the 4 flat connector, but I need the 7 for my toy hauler. I purchased the 2 30amp fuses & the relays. I picked up a 6000/10000 lbs hitch for $123 dollars. All I need is to get the 7 round adaptor connectoer. I am going to visit a junk yard to see if I can find one or hard wire one in.
My truck is an F250 SD Lariat 4X4. It has the 4 flat connector, but I need the 7 for my toy hauler. I purchased the 2 30amp fuses & the relays. I picked up a 6000/10000 lbs hitch for $123 dollars. All I need is to get the 7 round adaptor connectoer. I am going to visit a junk yard to see if I can find one or hard wire one in.
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Senior User
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On my van, ford already had the wiring in place to about where the rear axle is. There you could plug in a harness that ran to a 4 flat which the van came with or a harness that ran to the 7 round. No splices, no cuts, just plug in. I spent the $70 on the OEM connector harness and it was well worth it. All relays and fuses were already in place.
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Freshman User
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From: Clovis, Ca
I could not find the OEM 7 round connector @ a junkyard, so I picked one up @ Hitchfinder.com for $54 ship to my house. Not bad!!!!. The Ford dealership wanted $127 for it. That is nuts!!!
