KJ Supplementary tow harness

tomcater · **Joined:** Tue Sep 12, 2006 9:05 pm **Posts:** 33

Hello.

I have a 2003 Jeep Liberty.

When I purchased the car, it had no overhead console and a 4 way towing plug.

I purchased and installed EVIC and it works perfectly.

Now I want to upgrade the 4 way tow plug to a 7 as I'm getting a boat and need brakes.

Does it mean that I have to buy the 7 way harness and the supplementary harness even though I have installed the EVIC myself?

I'm confused as to what this extra harness does. Is it for breaks?

thanks for the help. Great forum

itsajeepthing · **Posted:** Wed Sep 10, 2008 8:46 pm

tomcater wrote:

When I purchased the car...

DryBones · **Posted:** Wed Sep 10, 2008 9:00 pm

whats the overhead EVIC have to do with trailer wiring harness?

Time to rewire and install a 7 wire harness. You can always get the 4 straight adapter if needed.

sleeve84028 · **Posted:** Thu Sep 11, 2008 6:48 am

There are two types of trailer brake systems:

1) Surge brakes - these rely on a sliding reciever (on the trailer) to activiate the brakes when the vehicle starts to slow down. They work OK but not the best

2) Hydraulic brakes - these require that you have a 7 pin harness and a brake controller. The blue wire of the harness powers the system and helps stop the trailer. These are the way to go IMO. Especially if you are pulling a trailer that is over 3000 pounds...

Buy the factory Tow harness from a place like jparts.com (you don't need the EVIC)

Jeepjeepster · **Posted:** Thu Sep 11, 2008 1:12 pm

You can keep the flat 4pin connector and get a 4 to 7 pin adaptor. It has a harness on it to let you wire in the electric brakes, battery, etc.

Check out etrailer.com, I bought two from there and use them.

The evic comes into play with the Jeeps actual wiring harness. If you have the evic you should have a wire ran to the back for the electric brake. Not sure if it changes anything else.

DryBones · **Posted:** Thu Sep 11, 2008 3:57 pm

you trying to tell me that my EVIC is wired to my trailer wire harness and will monitor or display info when I am trailering? :shock:

Holy Shmoly! :lol:

ATXKJ · **Posted:** Thu Sep 11, 2008 4:13 pm

if the EVIC is there - then an extra part of the wiring harness is there
There's a really good writeup in jeepkj country - but the server won't talk to me right now -
I'll try to add the link later

Linky
http://www.jeepkj.com/forum/showthread.php?t=26895&highlight=trailer+hitches

rangerd77 · **Joined:** Sat May 03, 2008 10:48 am **Posts:** 512

so what the he77 is a EVIC?

and how hard is it to wire up the 7 pin harness if you have no wiring at all?

sleeve84028 · **Posted:** Fri Sep 12, 2008 9:48 am

EVIC is the acronym form Electronic Vehicle Information Center. A.K.A the overhead console that displays temperature and fuel mileage.

That write up was fantastic.

jsc7002 · **Posted:** Fri Sep 12, 2008 11:25 am

rangerd77 wrote:

so what the he77 is a EVIC?

and how hard is it to wire up the 7 pin harness if you have no wiring at all?

not bad I bought a 4 flat that was a plug and go, just remove the taillights and plug in the new harness and then I got a 7round at an auto parts store for $25 and it plugs into the 4flat and then there are 3 wires to wire up for a brake controller and back up lights and one onther thing but I cant remember what

jsc7002 · **Posted:** Fri Sep 12, 2008 11:31 am

rangerd77 wrote:

so what the he77 is a EVIC?

and how hard is it to wire up the 7 pin harness if you have no wiring at all?

not bad I bought a 4 flat that was a plug and go, just remove the taillights and plug in the new harness and then I got a 7round at an auto parts store for $25 and it plugs into the 4flat and then there are 3 wires to wire up for a brake controller and back up lights and one onther thing but I cant remember what

JL Rockies · **Posted:** Fri Sep 12, 2008 12:19 pm

itsajeepthing wrote:

tomcater wrote:

When I purchased the car...

You just killed a cat.

Jeepjeepster · **Posted:** Fri Sep 12, 2008 1:19 pm

JL Rockies wrote:

itsajeepthing wrote:

tomcater wrote:

When I purchased the car...

You just killed a cat.

I am not a fan.. :evil:

KJ Supplementary tow harness

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