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-   -   Trailer wiring (http://www.jeepforum.com/forum/f28/trailer-wiring-1377082/)

gunterm 06-04-2012 11:39 AM

Trailer wiring
 
OK, been lurking for a while so I decided it's time to register! Especially since I have a question now :D

So our 2002 KJ Liberty was bought second-hand, has a factory hitch on it but no wiring, so I assume I'll need one of those tail light converter boxes instead of the factory tow wiring kit.

Got the build sheet from Chrysler, here is what's on it:

Code:

Vehicle Description JEEP LIBERTY SPORT 4X4 SPORT UTILITY 4-DR Model Year 2002 Body Model KJ J H 74 

Sales Code    Description
*M5 Cloth High-Back Bucket Seats
-DV Dark Slate Gray
AHMP Convenience Group I
AJPP Power Convenience Group
APAS Monotone Paint
A33P 3.7L Eng(EKG)/4Spd A/T 45RFE(DG4)
BAZS 136 Amp Alternator
BCPS 525 Amp Maintenance Free Battery
BRBS Power Front Disc/Rear Drum Brakes
CDBS Reclining Front Seats
CF5S 2nd Row Buckets, Power Fold/Tumble
CGGS Traveling Inboard Seat Belt Buckle
CGUS Child Seat Anchor System-LATCH Ready
CGXS RR Head Restraints Outboard Seating
CG1S Next Gen Multistage Front Air Bags**
CG6S Center Rear 3-Point Seat Belt
CKDP Floor Carpet
CKNS Cargo Compartment Carpet
CKTS Cargo Tie Down Loops
CK3S Plastic Swing Gate Trim Panel
CLEP Front & Rear Floor Mats
CLHP Cargo Trim Panel w/Storage Net
CLNS MOPAR Bright Door Sills
CLPS Door Sill Scuff Pads
CSRS Passenger Assist Handles
CSWS Driver Assist Handle
CTLS Base Door Trim Panel
CUFS Full Length Floor Console
CUKS Removable Ash Tray
DGBS All 4-Speed Automatic Transmissions
DG4 Multi-Speed Auto 45RFE Transmission
DHAP Lock-Up Torque Converter
DHNS Command-Trac Part Time 4WD System
DJJS Dana 30/186MM Front Axle
DMEP 3.73 Rear Axle Ratio
DRAP Corporate 8.25 Rear Axle EKG 3.7L V6 Engine
GBBS Tinted Windshield Glass
GCBS Front Door Tinted Glass
GEG Deep Tint Sunscreen Glass
GEKS Flipper Swing Gate Glass
GFAS Rear Window Defroster
GNAS Rear View Day/Night Mirror
GNCP Sun Visors w/Illum Vanity Mirrors
GT9P Power Mirrors, Fold-Away
GVBC All Vehicles W/Power Mirrors
GXMP Remote Keyless Entry
HAAP Air Conditioning
JAYS Instrument Cluster w/Tach
JCBS 120 MPH Primary Speedometer
JHAS Var Intermittent Windshield Wipers
JHBS Rear Window Wiper/Washer
JJAS Cigar Lighter
JJBS Dual Note Electric Horns
JJJS 12V Auxiliary Power Outlet
JJMP Auxiliary 12-Volt Rear Power Outlet
JKHS Glove Box
JPDP Power Windows, Driver One-Touch
JPHP Speed Sensitive Power Locks
K3AS STRIPE/BADGE/MOLDING/COLOR
LACP Illuminated Entry
LAJS Headlamps On Warning Chimes
LBDS Ash Tray Lamp
LCDP Map/Dome Reading Lamps
LDBP Cargo Compartment Lamp
LHDS Headlamp Off Time Delay
LMAS Halogen Headlamps
LNJ Fog Lamps
LPSS CHMSL Lamp
MFKS Body Color Grille
MHAS Black Windshield Moldings
MLCS Gray Fascias
MMGS Belt Moldings
MNAS Black Door Handles
MVCS Jeep Badge
MVDS 4X4 Badge
MVJS Sport Badge
MWGP Roof Rack
MZLP 3.7L Badge
MZ3S Liberty Badge
NAS 50 State Emissions
NBKS EVAP Control System
NBVP Low Emission Vehicle (LEV)
NF2S 18.5 Gallon Fuel Tank
NHFS Power Steering Cooler
PX8 Black Clear Coat
QX8S Black Clear Coat
RAAC All Radio Equipped Vehicles
RBK AM/FM Compact Disc Radio w/Chgr Ctrl
RCGS 6 Speakers
RDDS Fixed Long Mast Antenna
SBAS Power Rack and Pinion Steering
SCDS Luxury Steering Wheel
SDAS Normal Duty Suspension
SUAP Tilt Steering Column
TBBP Full Size Spare Tire
TBRS Outside Tire Carrier
TSN P235/70R16 OWL All Terrain Tires
TZAP Goodyear Brand Tires
WKBS Matching Spare Wheel
WLCP 16X7.0 Lux Styled Steel Wheels
WLYC All Steel Wheels
XEUS Front Suspension Skid Plate
XGGS Grocery Bag Hooks
XPFS Protective Coating and Remover
YAAS Build To U.S. Mkt. Specifications

We have the power steering cooler, and the "better" transmission (according to others) used only on the early KJ's so I shouldn't need any extra cooling to tow.

I was hoping the experts here could say for sure that I can't use the factory tow wiring harness, before I order the tail-light converter. One more question about the tail light boxes, I found two models, a Curt and the one etrailer.com sells. The Curt box is a very simple install similar to the etrailer one, except that the etrailer box has a 12V wire that you run up to the battery. My question is, should I get the etrailer box because it can draw extra power, or do the tail lights have enough electricity for the Curt box to work fine?

BTW, the tow load I'll be pulling is a 21' hybrid camper weighing 2200 pounds.

thanks in advance for the help!

95BadBoy 06-04-2012 05:34 PM

First post - welcome to the club - :)

If you are doing a seven pin type hookup (hope so) - I would lean towards the E-trailer one. You are planning in running trailer brakes aren't you? Teconsha brake controlers seem to work well on my tow rig.

gunterm 06-04-2012 07:41 PM

Trailer is a 4 pin I believe, with surge bakes. It's a rental so I don't really have much info on it.

TwoBobsKJ 06-05-2012 02:50 PM

I would STRONGLY suggest you go with the factory 7-pin round - gives you more options in the future and you avoid the dreaded electrical gremlins that tend to drive us Liberty owners nuts. Going with the converter opens the door to those problems...

The factory wiring harness literally clips right in. Yes, you need to run the wires up front and through the firewall but it's not that difficult - and since you have the factory hitch it will simply bolt on to the harness box that's already there. And if you add a brake controller later all the wiring is in place to do so.

The factory harness is going to cost you more but it will take no more time than the aftermarket converter harness and it is darn near guaranteed to work - as opposed to the aftermarket ones.

Here is a link to the harnesses. Scroll down to the 7-way round connector - and yes, you'll need the supplemental harness. Lots have tried to argue their way out of needing it but trust me - you need it since you don't have the required EVIC overhead console.

PM me if you have questions or need help installing it.

Bob

gunterm 06-05-2012 03:15 PM

I was going to go the 7 pin route, but some info I found made it sound like I'd have to take apart half the insides of it, is that true? Do you have a link to the instructions?

95BadBoy 06-05-2012 07:11 PM

Always a good idea to check a few of the discount online Mopar parts sites. If you have the part #'s which Bob has in his link - usually will save you a few bucks for the exact Jeep harness needed.

7 pin hookups are almost always a better way to go. Many will have the center pin (pin 7) that have the ability to activate the backup lights on a trailer if so equipped. Handy when backing into some sites at night. The simple 7 to 4 adapters work for any of the 4 pin stuff which I'm sure you already know. ;)

gunterm 06-06-2012 07:49 AM

Anyone know of free shipping deals for any of the mopar sites? Pricing seems to be the same on most when shipping is added.

gunterm 06-07-2012 01:25 PM

Use code SAVE10 for 10% off $100 or more

gunterm 06-09-2012 05:51 PM

To save money I only ordered the first harness for now, we'll see if it works at all. I don't have the evic but do have those premium features like keyless entry that I hope means I don't need the sup harness.

gunterm 06-12-2012 02:14 PM

It's here!

First off, all 4 pin trailer functions work fine: LT, RT, and BR. Obviously there's no +12 or trailer brakes on the 7.

The 21' TT is said to weigh 2300 dry by the place that rents it, however I think it's heavier than that; this will be my first experience with a TT so I'll defer to the renter.

They said it's a 7 pin but doesn't have trailer brakes, and would be towable with even a 4 pin adapter. I'm assuming it has 7 pin on it then for backup lights and charging the aux battery?

EDIT: I'm also getting backup lights as well, so the only parts that don't work without the harness are trailer brakes and +12, and there's a aux outlet in the back, so I might just find out which wires are those and rig something up :D

MikeKNR 09-17-2014 07:08 PM

So...Gunterm, how did it go two years ago and what have you done since? Bulliten (sp?) Boards like golf and sex need a good follow-through...


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