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Old 10-19-2011, 10:36 PM   #1
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7 Pin Trailer Wiring Harness

Quick question, Like most folks out there I ordered the max tow package on my 2012 JKUR. Unfortunatly I requre a 7 pin connector vice the 4 pin the vehicle came with. Too easy, so I thought. The dealer wants $200.00 for a mopar 7 pin wiring harness and they told me that they have to install it because they have to flash the vehicle's computer afterwards to make the change from the 4 to 7 pin connector (more money....labour). I have never heard of this before and dont quite understand why the computer needs to be flashed. So not wanting to pay another $200 on top of the $575 for the tow package I purchased a 4 to 7 pin adapter (vehicle side) It came with the extra wires for backup lights, brake control, ground and power lead. I connected the wires and all is working well. Is there something on the mopar wiring harnesses that require the computer to be flashed? I am an electronics technician and this boggls me a little so if anyone has any experience with this could you pass on your wisdome.
Thanks

Just to clairify why I need a 7 pin connector, I tow a small 4x8 single axle utility trailer that has brakes and a hydrolic lift (like a dump trucK) which means it has its own hydrolic pump and battery which needs to be charged by the tow vehicle. The GVRW of the trailer is 3900lbs, perfect for the rubicon.

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Old 10-20-2011, 06:46 AM   #2
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Quote:
Originally Posted by Bulldawgs View Post
The GVRW of the trailer is 3900lbs, perfect for the rubicon.
How is that "perfect for the rubicon" when your max towing capacity is 3500lbs? You're already over and you haven't put anything in the trailer.

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Old 10-20-2011, 06:51 AM   #3
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Quote:
Originally Posted by Bulldawgs View Post
Quick question, Like most folks out there I ordered the max tow package on my 2012 JKUR. Unfortunatly I requre a 7 pin connector vice the 4 pin the vehicle came with. Too easy, so I thought. The dealer wants $200.00 for a mopar 7 pin wiring harness and they told me that they have to install it because they have to flash the vehicle's computer afterwards to make the change from the 4 to 7 pin connector (more money....labour). I have never heard of this before and dont quite understand why the computer needs to be flashed. So not wanting to pay another $200 on top of the $575 for the tow package I purchased a 4 to 7 pin adapter (vehicle side) It came with the extra wires for backup lights, brake control, ground and power lead. I connected the wires and all is working well. Is there something on the mopar wiring harnesses that require the computer to be flashed? I am an electronics technician and this boggls me a little so if anyone has any experience with this could you pass on your wisdome.
Thanks


Just to clairify why I need a 7 pin connector, I tow a small 4x8 single axle utility trailer that has brakes and a hydrolic lift (like a dump trucK) which means it has its own hydrolic pump and battery which needs to be charged by the tow vehicle. The GVRW of the trailer is 3900lbs, perfect for the rubicon.

Could be just money for the dealership....
My Libby came with a 7 to 4 Mopar adapter, 7 pin harness and Class III hitch. Wranglers get robbed....
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Old 10-20-2011, 07:56 AM   #4
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I'm assuming it has something to do with the CAN-BUS system IF it has to be flashed. I know on my mom's 2010 Chrysler 300, that D**N Can-Bus system is stupid. To install a trailer wiring, you have to have a converter that pulls it power directly from the battery, otherwise the system believes there is an error and won't work correctly.

Anyways, good luck and don't wear that little V6 out towing that trailer.
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Old 10-20-2011, 12:57 PM   #5
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Originally Posted by daggo66 View Post
How is that "perfect for the rubicon" when your max towing capacity is 3500lbs? You're already over and you haven't put anything in the trailer.
I think a deffinition of GVWR is needed, I think you may be confusing curb weight with GVWR:

A gross vehicle weight rating (GVWR)[1] is the maximum allowable total weight of a road vehicle or trailer when loaded - i.e., including the weight of the vehicle itself plus passengers, and cargo.
The difference between gross weight and curb weight is the total passenger and cargo weight capacity of the vehicle. For example, a pickup truck with a curb weight of 4,500 pounds (2,041 kg) might have a cargo capacity of 2,000 pounds (907 kg), meaning it can have a gross weight of 6,500 pounds (2,948 kg) when fully loaded

I would never load a trailer to its max capacity, not good for the trailer. I usually try to stay within 80% of the trailers capacity. In the case of my trailer, 80% of the GVWR of 3900 pounds would be 3120 pounds. Safely under the Rubicons max tow rating of 3500 pounds. I guess I should have clairified my statement of a perfect match of trailer to vehicle with respect to tow ratings. As the trailer weighs 1056 pounds bare, this will alow me to load the trailer with up to 2064 pounds of what ever. This will alow me to safely stay under the GVWR of the trailer and the Max Tow rating of the Rubicon.
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Old 10-20-2011, 12:58 PM   #6
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Quote:
Originally Posted by deathphoenix99 View Post
I'm assuming it has something to do with the CAN-BUS system IF it has to be flashed. I know on my mom's 2010 Chrysler 300, that D**N Can-Bus system is stupid. To install a trailer wiring, you have to have a converter that pulls it power directly from the battery, otherwise the system believes there is an error and won't work correctly.

Anyways, good luck and don't wear that little V6 out towing that trailer.
Thanks, that makes sense.
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Old 02-26-2012, 11:22 AM   #7
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Quote:
Originally Posted by Bulldawgs View Post
Quick question, Like most folks out there I ordered the max tow package on my 2012 JKUR. Unfortunatly I requre a 7 pin connector vice the 4 pin the vehicle came with. Too easy, so I thought. The dealer wants $200.00 for a mopar 7 pin wiring harness and they told me that they have to install it because they have to flash the vehicle's computer afterwards to make the change from the 4 to 7 pin connector (more money....labour). I have never heard of this before and dont quite understand why the computer needs to be flashed. So not wanting to pay another $200 on top of the $575 for the tow package I purchased a 4 to 7 pin adapter (vehicle side) It came with the extra wires for backup lights, brake control, ground and power lead. I connected the wires and all is working well. Is there something on the mopar wiring harnesses that require the computer to be flashed? I am an electronics technician and this boggls me a little so if anyone has any experience with this could you pass on your wisdome.
Thanks

Just to clairify why I need a 7 pin connector, I tow a small 4x8 single axle utility trailer that has brakes and a hydrolic lift (like a dump trucK) which means it has its own hydrolic pump and battery which needs to be charged by the tow vehicle. The GVRW of the trailer is 3900lbs, perfect for the rubicon.
We're waiting for delivery of our 2012 JKUR with max tow, I need to get the brake contol and 7 pin harness ready for installation.

I'm wondering about what control you used and where did you find a reference to ID the extra wires for connecting the control and 7 pin harness?
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Old 02-26-2012, 03:03 PM   #8
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Wow. Don't know about the 2012, but I installed the Mopar 7 pin harness myself and it works perfectly on my 2010. I didn't have to flash the computer - maybe something changed for 2012? The only tricky thing was to find a wire for the trailer brake to tap into. I found a wire based on another post somewhere and tapped it. My setup works without a flaw. If you are even halfway handy, it's a very easy install to do yourself.
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Old 04-07-2012, 08:12 PM   #9
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Paid 95.00for mine from dealer and no flash.
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Old 04-08-2012, 06:17 AM   #10
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Quote:
Originally Posted by IBNJPN View Post
We're waiting for delivery of our 2012 JKUR with max tow, I need to get the brake contol and 7 pin harness ready for installation.

I'm wondering about what control you used and where did you find a reference to ID the extra wires for connecting the control and 7 pin harness?

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Old 04-08-2012, 09:58 AM   #11
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Quote:
Originally Posted by Bulldawgs View Post
to clairify why I need a Mopar 7 pin connector, I tow a small 4x8 single axle utility trailer that has brakes and a hydrolic lift (like a dump trucK) which means it has its own hydrolic pump and battery which needs to be charged by the tow vehicle. The GVRW of the trailer is 3900lbs, perfect for the rubicon.
The previous owner of my Wrangler had the dealer install a 7-pin connector when it was bought new. I've plugged it up to my pop-up camper and all the lights work just fine, but I'm not sure if my dealer also flashed the computer on my wrangler or not.

Not sure the electric brakes on your trailer will work without a brake controller, so if you are looking for a good brake controller I use the Tekonsha Prodigy P2 Brake Controller - Proportional on another vehicle I have and it works great.
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Old 04-08-2012, 10:02 AM   #12
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Old 04-08-2012, 01:31 PM   #13
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bought and installed the 7 pin from mopar pretty painless even has the long enough blue wire to run into firewall for future brake controller, works fine 2012 jku sport with max tow 373 and limited slip

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