2020 WK2 Trailhawk w/tow pkg - 7 wire question - JeepForum.com
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post #1 of 5 Old 07-05-2020, 09:23 PM Thread Starter
805Tubbs
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2020 WK2 Trailhawk w/tow pkg - 7 wire question

With the upgraded tow pkg on the new 2020 Trail Hawk 5.7, I would assume the 7 pin system is fully functional just plug in the brake controller with adapter harness under dash and thats it!! Correct. ?

Or do you have to still run a duplex wire from engine/controller to rear plug to complete wiring of all trailer braking function

controller is a tekonsha p2.

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post #2 of 5 Old 07-05-2020, 10:34 PM
ColdCase
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When you say upgrades, you mean the jeep was equipped with trailer tow at the factory or was it a dealer installed accessory. The factory will have all the wires. Dealer installed should if they installed everything.

I was born with nuttin' and I still have most of it
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #3 of 5 Old 07-06-2020, 05:29 AM Thread Starter
805Tubbs
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Thanks ColdCase, yes its a factory installed tow option. there is so much conflicting info out there i started to wonder?? I figured Trailhawk would have full function at 7pin plug without more wiring but "never assume" right. I know i do need to add additional wiring to my Dodge ram since it only had 4 pin setup now will have conversion to 7pin with black and blue wires from battery and controller run from engine compartment/cab.
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post #4 of 5 Old 07-06-2020, 06:16 AM
ColdCase
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There is nothing unique about the TrailHawk wiring, all WK2s with trailer tow are the same. Both my RAM and WK2 have two trailer plugs at the hitch, a 4 pin and 7 pin. I don't recall how many pins are under the dash, but the adapter harness plugged into the P2 and Jeep without issue. There are an always on IOD sense, brake output, brake lamp input, and ground wires there.
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I was born with nuttin' and I still have most of it
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #5 of 5 Old 07-15-2020, 11:51 AM
George C
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For a few bucks you can get this from amazon, plug it in and check the lights. https://www.amazon.ca/dp/B001EOWQY4?...p_mob_ap_share
Worked for me (my factory installed tow package is lighting up all the lights). Then yes, just install brake controller. Etrailer shows how to install.
https://www.etrailer.com/tv-install-...kee-90195.aspx
Very easy but make sure you buy the additional wire harness that plugs into the jeep AND into your controller.
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