Adapter Solution for Going from Military 12 Pin Trailer Connector to Standard 4 or 7-Way
Updated 01/03/2018 | Published 01/01/2018
Products Featured in This Question
Question:
Do you have a product that would convert military 12 pin to 7 or 4 pin ? Or do you have a product that will allow for wiring a military K5 to civilian trailer?
asked by: Clay S
Expert Reply:
We do not offer any wiring adapters to convert a 12-pin female connector on a military vehicle to a standard RV-style 7-way like # 37185 or a 4-pole like # 18252. But you can install a different type of trailer socket on the truck by hardwiring one.
Based on the information I could find about your military connector the wires have letter codes on them and carry the following functions common on most trailers:
J is the right turn signal
B is left turn signal
E is tail lights
D is ground
K is 12 volt power
Usually trailers use the same wire/light for both stop and turn signals. On a 4-pole trailer connector the green wire carries right turn and stop signals and the yellow wire carries left turn and stop. If this is how your trailer lighting is set up you'll need a tail light converter on the truck to combine the stop and turn signals. You can use kit # 119250KIT. This kit includes a circuit tester to help you confirm the function carried on each wire.
The above wires will connect to the 4-pole harness as follows:
J is the right turn signal and connects to the GREEN wire.
B is left turn signal and connects to the YELLOW wire.
E is tail lights and connects to the BROWN wire.
The harness' WHITE ground wire with ring terminal grounds to the frame.
If you decide to convert this 4-pole to a 7-way format you can use part # 37185. This will plug in to the 4-pole and provides 3 additional wire leads with butt connectors for the extra circuits. Typically these extra circuits are for trailer brake signals (blue wire), reverse light signal (purple wire) and for 12V auxiliary power for the trailer (black wire).
If you do need trailer brake signals then instead you can use our kit # ETBC7 which has a 37185 plus other items to give you a fully-functioning 7-way, such as wiring, circuit breakers and connectors. I have linked an install video for the ETBC7 to show you the process in a 1994 C/K series pickup.
Continue Researching
- Shop: Brake Controller
- Shop: Antenna Mounting Bracket for Kuat Ibex Truck Bed Racks
- Q&A: How to Convert a Military Wired Trailer to a 6-way Civilian Trailer Connector
- Shop: Dexter Fortress Threaded Aluminum Oil Bath or Grease Cap for 5.2K to 8K Axles
- Shop: Trailer Wiring
- Q&A: Parts Needed to Add 7 Way Trailer Connector to 2020 Jeep Wrangler without Towing Package
- Video: The Low-Down on the Trailer Hub Grease Cap, 2.72" OD Drive In
- Shop: Trailer Hitch
- Search Results: trailer hitch
- Video: How to Choose a Trailer Brake Controller
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Article: Trailer Wiring Diagrams
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Video: An In-Depth Look at the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Search Results: trailer wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Shop: Suspension Enhancement
- Search Results: trailer tires and wheels
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Shop: Curt Echo Wireless Brake Controller - 7-Way Plug-in w/ Bluetooth App - Up to 2 Axles - Proportional
- Video: Redarc Tow-Pro Liberty Brake Controller Review RED24FR
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Article: How to Measure for Trailer Hitch Drop
- Video: What to Know About the Curt TriFlex NEXT Trailer Brake Controller
- Q&A: Installation Time for Blue Ox BX1128 Flat Tow Base Plate Kit for 2016 Jeep Grand Cherokee
- Shop: Redarc Tow-Pro Liberty Brake Controller w/ Universal Wiring Harness - Dash Knob - Proportional
- Search Results: trailer jack
- Search Results: brake controller
- Video: Feature Breakdown: Universal Installation Kit for Trailer Brake Controller
on Custom Fit Vehicle Wiring
