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factory 7-way OBS wiring oddity

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  #16  
Old 01-25-2018, 12:29 AM
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yep those are it. i already have the factory rear harness. 6pin round was changed out for a 7way.

if someone needs the rear harness ill let them have it. otherwise probably good to have as a spare. but yeah if you feel like shipping that relay box it may save me a trip to the pick n pull.

Originally Posted by McLeod
I am pretty sure I have, in a pile of spare parts, the trailer relay assembly that locates outside the Power Distribution Box under the hood.

I also have the under rear bumper Ford trailer connector.
If you are interested in them , I could go take a look and verify
Let me know...

EDIT:

I think these are the OEM addtnl. trailer towing relays:



The truck I took it off of had it mounted on the rearward side of the PDB in place of the Bronco 4 relay version shown below and it plugged into the two connectors as marked:




Factory 6 round prong -under the bumper- female coupler w/ an '92 engineering id number (off of a '92 or '93 f250):



My '95 Bronco has OEM 7 blade RV Plug along with a matching Ford male plug for the trailer side in the original box
 
  #17  
Old 01-25-2018, 07:24 AM
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No, he is saying his truck came factory with the 7 round pin semi plug
But you disagreed with him, did you not?

the SEMI large round with round pins was NOT factory
 
  #18  
Old 01-25-2018, 08:51 AM
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McLeod that grey FORD 7-pin (semi-style) was EXACTLY what I took of my 92 and repinned wires to a 7-blade RV style.
 
  #19  
Old 01-25-2018, 05:51 PM
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Originally Posted by jas88
But you disagreed with him, did you not?
Yup, but no point in arguing with him since he doesnt know what a semi plug is or a RV plug
 
  #20  
Old 01-25-2018, 06:17 PM
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I'm confused. Who doesn't know the difference between 7 pin round (semi - style) vs 7 blade RV?
 
  #21  
Old 01-25-2018, 06:26 PM
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Originally Posted by BLK79
McLeod that grey FORD 7-pin (semi-style) was EXACTLY what I took of my 92 and repinned wires to a 7-blade RV style.
Strange that they would have used the [semi???] round pin style.
Even in the early 90's the flat bladed receptacles were mainstream on civilian type equipment
 

Last edited by McLeod; 01-25-2018 at 06:40 PM. Reason: I do not know what a semi plug is or looks like
  #22  
Old 01-25-2018, 06:28 PM
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Originally Posted by BLK79
I'm confused. Who doesn't know the difference between 7 pin round (semi - style) vs 7 blade RV?
You. You dont know the difference. If you notice, in the pic That McLEOD posted(the one that you said was"exactly what I took off my 92") is indeed a 7 pin RV plug NOT a 7 pin semi plug
 
  #23  
Old 01-25-2018, 06:46 PM
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Just so everyone is talking about the same thing:

 
  #24  
Old 01-25-2018, 08:58 PM
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Here is one like I pulled off of a truck at pull a part. I was all happy until I opened it up and saw the 7 pin round connection.
 
  #25  
Old 01-25-2018, 10:08 PM
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DieselBrad, you are confused. I KNOW what I took off my truck. You don't. If you look at the diagram on the cover of the plug posted (one I said exactly like mine) it has 7 PINS - NOT BLADES. I do know the difference, I have driven class 8 trucks for many years, and also own one, a 379 EXT. So plenty of experience with pneumatic trailers, vans, doubles, etc, ALL of which have light cords. Which incedentally, were SAME style as the FORD plug on my 92, also identical to pic. Kinda like BETA vs VHS I guess, the 7 pin never really took off in the light duty world as a standard. Seems the RV 7 blade is now the most common.
 
  #26  
Old 01-28-2018, 05:27 AM
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My 92 has the pinned version oem.
 
  #27  
Old 01-28-2018, 06:16 PM
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My '97 F250HD has the 7 contact RV OEM Ford connector with blades.
 

Last edited by raystankewitz; 01-28-2018 at 06:17 PM. Reason: Fixed post information
  #28  
Old 01-28-2018, 06:44 PM
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Originally Posted by Diesel_Brad
Factory trailer plugs were a 4 flat(with 4 small round pins) OR a large round (with 6 flat spades and a round in the center)
the SEMI large round with round pins was NOT factory
Originally Posted by Diesel_Brad
If you notice, in the pic That McLEOD posted(the one that you said was"exactly what I took off my 92") is indeed a 7 pin RV plug NOT a 7 pin semi plug
Actually, the one I posted a picture of is a 7 ROUND pin plug -- not a 7 flat blade RV style and it was an OEM piece evidenced by the Ford logo on it.
It looks just like what the chart denotes as a "7 semi".
It did come out of either a 92 or 93 F250 junkyard truck.


Up until this thread came up, I had never heard of the term "semi style"

But 94 up may be all 7 flat blade RV type though, given the responses.
My 95 Bronco has the 7 flat blade RV type (like someone would want to tow a larger trailer with a Bronco - YIKES!!)
 
  #29  
Old 01-28-2018, 08:01 PM
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McLeod
My 95 also has the 7 blade, it has towed my 14 ft many miles, but it also has trailer brakes.
 
  #30  
Old 01-28-2018, 08:58 PM
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I'm way more comfortable in a long bed truck when towing more than 2,000 lbs- trailer brakes or no...
Not saying it can't be done, only that long bed trucks are more stable and forgiving in the event of a sudden manuever
 
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