Trailer Wiring Adapter Q
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Trailer Wiring Adapter Q
My '73 F100 has this 4-pin round trailer wiring port in the bumper:
I bought this adapter to 4-pin flat thinking it would work:
Amazon.com: Curt Manufacturing I-444 4 Way Round To 4 Way Flat Adaptor: Automotive
The OD of the adapter is just a bit too large to fit the ID of the hole.
Does anybody know of an adapter that would work? I don't want to cut and splice, and just want to be able to tow a small trailer.
Thanks in advance.
-MK
I bought this adapter to 4-pin flat thinking it would work:
Amazon.com: Curt Manufacturing I-444 4 Way Round To 4 Way Flat Adaptor: Automotive
The OD of the adapter is just a bit too large to fit the ID of the hole.
Does anybody know of an adapter that would work? I don't want to cut and splice, and just want to be able to tow a small trailer.
Thanks in advance.
-MK
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,186
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From: S/W Missouri, Polk county
Looks like what you need, maybe try a farm store with different style/types 4 pin adapters?
Might need to get an older style "horse trailer" 4 pin adapter.
Or if its "just a bit to large" any chance you can grind off the difference?
Good luck......
Might need to get an older style "horse trailer" 4 pin adapter.
Or if its "just a bit to large" any chance you can grind off the difference?
Good luck......
Posting Guru
Joined: Nov 2009
Posts: 1,219
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From: Norton, MA
Just a word of advice from my experience (and in the trailor category, that is admitedly close to none) but when something is purposely made to not fit, for no obvious reason, it's probably designed that way intentionally so that you caaan't use it incorrectly (in a way that would say, draw too much voltage).
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Yeah I'm sure there's an adapter out there that fits, just need to find it. Hence the forum post. I'm definitely not going to grind down the adapter to make it fit.
Anybody else have a plug like this in their bumper?
-MK
Anybody else have a plug like this in their bumper?
-MK
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From: Alabama
Check your wiring harness that connects your rear tail lights. There is a "T" adapter you can buy for around $20 that plugs directly into your original wiring harness, and drops you a flat 4 harness. You may be able to find a plug to fit your application...but that is another option. I will get the info for you in the a.m. if you want, they had to order mine from their supply house, and I had it the following day.
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Senior User
Joined: Oct 2010
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Check your wiring harness that connects your rear tail lights. There is a "T" adapter you can buy for around $20 that plugs directly into your original wiring harness, and drops you a flat 4 harness. You may be able to find a plug to fit your application...but that is another option. I will get the info for you in the a.m. if you want, they had to order mine from their supply house, and I had it the following day.
Any idea what originally went in there? Was there some standard harnes in the 70's that no longer exists.
-MK
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Lead Driver
Joined: Mar 2010
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From: West Virginia
there was NO standard... nowadays you pretty much have the round 7 pin and the 4 flat. But 30 or 40 years ago, there were like 6 different kinds.... my friend picked up an old trailer and it had a round plug so he got a round plug adaptor, and even tho it plugged in, the connectors were different. I had to cut and splice it to get it good enough to tow home.
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Posting Guru
Joined: Mar 2009
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From: Alabama
Check your wiring harness that connects your rear tail lights. There is a "T" adapter you can buy for around $20 that plugs directly into your original wiring harness, and drops you a flat 4 harness. You may be able to find a plug to fit your application...but that is another option. I will get the info for you in the a.m. if you want, they had to order mine from their supply house, and I had it the following day.
Advance Auto Parts: Vehicle Wiring Kit by Hoppy - Part 40105
I know the major auto part stores have them (around here they were all next day pick-up), you just have to ask them to look up the part number...Hope this helps...
More Turbo
Joined: Mar 2011
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From: Heber, UT
I work part time at a trailer store in the summers and I would strongly suggest getting it wired for a flat four especially if the only trailer you are going to pull is a flat 4. You could also find a round four male end for the trailer and just change the plug on the trailer. The round four is pretty much out dated and you always run into problems with adapters. If you do have to cut and splice wires just make sure to use heat shrink butt connectors and wrap them up really good in electrical tape. We do that all the time and never have any problems. If you do want use adapters I would reccommend you wire a round 7 on the truck and then get an adapter that goes to both the 6 round and the flat 4, that way you can pull any trailer you want.
Moderator & parts slinger
Joined: Feb 2007
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From: S/W Missouri, Polk county
4 pin for lights only, 6 or 7 pin (depends on trailer plug) lights and brakes and yes you will need a brake controller. If you can not get and or figure out a "plug and play" take it some where and just get it done.
Will be less headache for you in the end, IMO
Will be less headache for you in the end, IMO
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