Military to Civilian Trailer Adapter - Toyota FJ Cruiser Forum
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#1 (permalink) Old 11-13-2010, 12:48 PM
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Military to Civilian Trailer Adapter

Could not find this posted anywhere so I thought I would review how I did it.

One could just cut the military plug off and spice in something else. However, I wanted to keep the trailer harness intact, so I chose to build an adapter.

First we look at the stock FJ setup, a standard 4 pin connector. You will need to buy a 4 pin male trailer connector that fits this, about $4 for me.



The trailer sports a 12 pin connector. Don't bother trying to find an adapter at the hardware store, they will just look at you funny if you ask.



I got a military vehicle trailer receptacle from Saturn Surplus. TRLRPLUG It ran me $22.50. The plug I got did not have any attached wires. What you see here is after I connected it to the 4-pin male:





The wiring basics I used:

Civilian......Military.....Function
Green........J.............RH stop and turn
Yellow.......B.............LH stop and turn
Brown........E............Tail/Running lights
White........D & L.......Ground

I used a scrap piece of aluminum to make a bracket and sealed up the back side with liquid electrical tape:



Installed it on the FJ using the same bolt the stock setup uses:


This allows me to tow either military or 4 pin civilian applications. Total cost was about 1/2 hour and $30.

2010 FJ Cruiser TT
2009 Mini Cooper JCW
1999 Dakota R/T
1996 Dodge Stealth R/T Twin Turbo



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#2 (permalink) Old 11-13-2010, 08:06 PM
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Re: Military to Civilian Trailer Adapter

I'm interested in knowing why you kept the 12 pin? I would consider that the first thing to go since its a bunch of old wires and a military connection.
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#3 (permalink) Old 11-13-2010, 09:08 PM
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Re: Military to Civilian Trailer Adapter

The military stuff is heavy duty compared to other trailers I have had. It actually looked refurbished recently, so I kept it.

Plus if someone ever steals it maybe they will get pulled over for having trailer lights that don't work.

2010 FJ Cruiser TT
2009 Mini Cooper JCW
1999 Dakota R/T
1996 Dodge Stealth R/T Twin Turbo



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#4 (permalink) Old 01-20-2011, 11:30 PM
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Re: Military to Civilian Trailer Adapter

Thx for the post.

I'm thinking I'll do the same, except mount the adapter on the trailer so I can use any of my vehicles to tow it.

2007 Black Diamond | 6MT | 4x4 |Trail-Gear Sliders | BFG MT KM2's 255/80-R17 | Icon Stage One 3" Lift | Camburg UCA's | Body Mount Chop | All Pro adjustable rear LCA's | Lucrum Winch Mount W/Light Bar | Hella 500 driving lights | Warn M8000 winch | Ramsey Wireless Winch Controller | Wet Okole seat covers | Yaesu FT-8800R | Garmin Nuvi 350 | This isn't a "build", simply a bunch of parts I put on my FJ so I could beat the living cr@p out of it | No fancy pics or contributors and no attempts to "buff" out pinstriping or dents! It is what it is, a great all around vehicle that's a blast to drive anywhere, regardless of the dents and scratches!
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#5 (permalink) Old 08-06-2011, 07:08 PM
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Re: Military to Civilian Trailer Adapter

Does the stock 12 pin plug in and hold easily? I just bought a M101 but thought I might need a support bracket to hold the weight of the plug.

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#6 (permalink) Old 08-08-2011, 06:18 AM
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Re: Military to Civilian Trailer Adapter

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chico1 previously said: View Post
Does the stock 12 pin plug in and hold easily? I just bought a M101 but thought I might need a support bracket to hold the weight of the plug.

Sean
It seems to stay in fine the way I have it set up. It is pretty snug. You actually have to pull a bit to get the military plug out of the military outlet.

2010 FJ Cruiser TT
2009 Mini Cooper JCW
1999 Dakota R/T
1996 Dodge Stealth R/T Twin Turbo



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#7 (permalink) Old 08-31-2011, 03:20 PM
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Re: Military to Civilian Trailer Adapter

I'd like to buy something already made. This guy on eBay has a nice harness. It's made as a 7 pin but he will make 4 pin. I dint have my trailer kit yet so my question is , are the oem FJ's 7 or 4 pin?military trailer adapter harness M101A1,A2A3 M1101 M105 | eBay
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#8 (permalink) Old 09-02-2011, 08:21 PM
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Re: Military to Civilian Trailer Adapter

FJ is 4 pin.

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#9 (permalink) Old 09-06-2011, 09:54 PM
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Re: Military to Civilian Trailer Adapter

Pics of ur rig pulling the trailer.

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#10 (permalink) Old 09-07-2011, 06:14 AM
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Re: Military to Civilian Trailer Adapter

Quote:
PERFECT Z28 previously said: View Post
Pics of ur rig pulling the trailer.
Sure, these are before I put the lift on though.






2010 FJ Cruiser TT
2009 Mini Cooper JCW
1999 Dakota R/T
1996 Dodge Stealth R/T Twin Turbo



FJ Build Thread:
http://www.fjcruiserforums.com/forum...tts-build.html

Trailer Build Thread:
http://www.fjcruiserforums.com/forum...rk-hauler.html
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