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Author Topic: 4 Pin to 7 Pin Adapter and power to the electric brakes  (Read 6383 times)

Hfx_Cdn

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4 Pin to 7 Pin Adapter and power to the electric brakes
« on: April 17, 2014, 01:23:10 PM »
     We're still in Florida, and it's been a long time since I've looked at a trailer wiring set up.  Our daughter is in the process of picking up a new to them PUP.  She tells me that it has a 7 pin wiring connector, and I know that their 2007 Jeep Liberty is wired with a 4 pin connector.  I see on line that there are adapter available, but it doesn't say if it would provide power to the electric brakes.  Do any of you know?
     Look out, that will make 3 out of 4 who will be RVrs, with the 4th a wanna be, but is into boating for the time being.

Ed
Ed & Donna
Winter-Pinellas Park FL, Summer- Maritime Canada
2000 Coachmen Catalina 34' DP (owned 2004 to 2015)
2006 Jeep Liberty Toad

donn

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #1 on: April 17, 2014, 02:02:11 PM »
NO!
4 wire is for lights and turn signals only.
If the tent trailer has electric brakes they will need to install a 6 or 7 pin harness, and add a brake controller.

Hfx_Cdn

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #2 on: April 17, 2014, 02:15:18 PM »
    That was my gut too, thanks.

Ed
Ed & Donna
Winter-Pinellas Park FL, Summer- Maritime Canada
2000 Coachmen Catalina 34' DP (owned 2004 to 2015)
2006 Jeep Liberty Toad

Gary RV_Wizard

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #3 on: April 17, 2014, 05:31:41 PM »
The 4/7 adapter lets you use a 4 pin trailer plug on a 7 pin tow vehicle outlet, but it doesn't work the other way. You can't get brake wire or 12v charging connections from the 4-pin cause it doesn't have any.

So if the PUP has brakes, she will need a 7 pin connector AND a brake controller as well. If the PUP doesn't have brakes (under 1500-2000 lbs GVWR may not), then the plug could be swapped out for a 4 pin.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

Hfx_Cdn

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #4 on: April 18, 2014, 07:14:59 AM »
     Thanks Gary, I'm going by what she's telling me.  It is a small 2005 Coachmen Viking PUP model 2170, I would have thought that if anything, it would have surge brakes, but won't know until I head north in a month.  But from what I see on the net, electric brakes were an option and the ad says it has them, and the specs shows a GVWR of 2,710 pounds.

Ed
Ed & Donna
Winter-Pinellas Park FL, Summer- Maritime Canada
2000 Coachmen Catalina 34' DP (owned 2004 to 2015)
2006 Jeep Liberty Toad

wecoyote

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #5 on: April 18, 2014, 07:49:10 AM »
To support Don and Gary, if the Jeep has only a 4 pin, you are missing the lines to control the brakes (blue wire) and keep the house battery charged (black wire) on the trailer.  I was in a similar situation with our old Suburban that had only the four pin.

I ended up buying one of these at my local auto parts store (Hopkins 47205):
http://www.hopkinstowingsolutions.com/products/vehicle-wiring-connectors/7-rv-blade/4-wire_flat_to_7_rv_blade_plastic_adapter.html

It converts the 4-pin to 7 and then gives you a place to run the two additional lines.  The nice thing is, the pin-out is already done for you preventing mis-wiring.  From there they will need to two fused feeds from the battery.  One runs to the brake controller to provide it power and the other to the rear of the Jeep to connect to the black wire on the connector.  Then, it is as simple as taping the brake switch for the brake controller and running a blue wire from the brake controller to the rear connector.

If that seems too confusing, here is a diagram for just the brake controller:
http://www.etrailer.com/faq-brakecontroller.aspx

Hopefully this helps more than confuses!

W.E. Coyote (Super Genius)

'99 Yukon (named Cornelius)
'14 Coachmen Freedom Express 23TQX Hybrid

2 Adults, 2 Kids (13 and 9), 1 Boston Terrier and 1 Retired Racing Greyhound

Royal Oak, Michigan

Gary RV_Wizard

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #6 on: April 18, 2014, 09:05:20 AM »
The key thing is that she will need to buy a brake controller for the tow vehicle and have it wired in.  I recommend the Tekonsha Prodigy "P" family of controllers. Local shops tend to install slightly cheaper brands/models or ones they have traditionally used, but the Prodigy series has superior technology vs many others (my opinion, of course).
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

redbarber

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #7 on: April 18, 2014, 09:14:10 AM »
+1 on the Prodigy.  I just installed one in my truck and it's a HUGE improvement over the Hopkins Brake Force controller I had before.  Not as cheap, but worth every penney.  Tekonsha has great phone support too!
2014 Forest River Rockwood Signature Edition (32' 5er)
2006 Chevy Silverado 3500 Dually

Hfx_Cdn

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #8 on: April 18, 2014, 06:59:42 PM »
     Thanks all, electric brakes are all new to me.

Ed
Ed & Donna
Winter-Pinellas Park FL, Summer- Maritime Canada
2000 Coachmen Catalina 34' DP (owned 2004 to 2015)
2006 Jeep Liberty Toad

HueyPilotVN

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #9 on: April 18, 2014, 07:07:21 PM »
Are you sure that the Jeep does not also have a 7 pin connector tucked up under the rear bumper.  I have a 2007 Jeep Commander and it definitely has both connectors tied up under the rear bumper.
Bill Waugh
40' Country Coach DP
34' Stacker Trailer, Trailer Toad
Jeep Commander
Mustang Bracket Race Car
35 years on the road

Hfx_Cdn

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #10 on: April 18, 2014, 07:16:17 PM »
    As I said above, we are still in St Petes, they are in Nova Scotia.  But, I am virtually certain that the Jeep did not have a tow package, so no wiring harness, I'm fairly sure it, and the hitch, was added by my son to let them use a utility trailer.

Ed
Ed & Donna
Winter-Pinellas Park FL, Summer- Maritime Canada
2000 Coachmen Catalina 34' DP (owned 2004 to 2015)
2006 Jeep Liberty Toad

DavisK

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #11 on: April 18, 2014, 08:21:42 PM »
     Thanks Gary, I'm going by what she's telling me.  It is a small 2005 Coachmen Viking PUP model 2170, I would have thought that if anything, it would have surge brakes, but won't know until I head north in a month.  But from what I see on the net, electric brakes were an option and the ad says it has them, and the specs shows a GVWR of 2,710 pounds.

Ed

With a GVWR of only 2,710 lbs. it probably doesn't have brakes. Most states don't require brakes on trailers less than 3,000 lbs.
« Last Edit: April 19, 2014, 06:05:18 AM by DavisK »
2013 Silverado 2500 HD LTZ CC 6.6L Duramax Diesel
2014 Sunset Trail SF270BH
Holly & Buster, mini Dachshunds

HueyPilotVN

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #12 on: April 18, 2014, 08:37:02 PM »
A Liberty is not a very large SUV.  If the trailer has electric brakes, all it would take to make it safer to pull with the Liberty is a brake controller and a blue wire of suffecient guage run to the connector.  I would hook up the trailer brakes for added safety for yout Daughter.  If you do not have a controller, I have an extra one that I will give you for your peace of mind regarding your daughter.  It is a Prodigy.  PM me.
« Last Edit: April 18, 2014, 08:41:22 PM by HueyPilotVN »
Bill Waugh
40' Country Coach DP
34' Stacker Trailer, Trailer Toad
Jeep Commander
Mustang Bracket Race Car
35 years on the road

Gary RV_Wizard

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #13 on: April 19, 2014, 08:41:48 AM »
DavisK is right that most states have a 3000 lb cut-off for trailer brakes, but several do not and have either a lower limit (as low as 1000 lbs empty) or they specify a minimum stopping distance instead of a weight. Some of the Canadian provinces have lower limits as well. For that reason, many trailer manufacturers include brakes as standard on smaller trailers, or dealers order them with optional brakes so that they will be legal wherever they travel.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

robertusa123

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Re: 4 Pin to 7 Pin Adapter and power to the electric brakes
« Reply #14 on: April 19, 2014, 07:34:01 PM »
Check if the trailer has brakes.  Someone might have put the 7 pin connected on the trailer because their tow vehicle had one.     I changed a 17/8 hitch on my ulitel trailer so I would end haft to keep changing my ball on my truck   now all my trailers are 2in 
1996  26ft. 3 kids 2 dog and the wife too

 

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