OEM Part #

[mag03kj]

Does anybody know the part number for 03 oem hitch wiring harness?

 

[tommudd]

etrailer has one just as good and cheaper
plug and play

just saying

 

[RageOfFury]

The plug and play one, aka the T-connector harness, is fine for a trailer that only has 2 lights. But if you plan on pulling a trailer with multiple lights, side markers, etc, go for the Modulite protector harness. It's a powered harness that offers more amperage to run more lights.

 

[kb0nly]

82207290 02-07 Liberty Four Pin Plug Towing Harness

http://www.libertypartsstore.com/product_info.php?products_id=213

The link is the best price i have seen on them. However, its wired the SAME as the Hopkins 42475. Which costs less and works just as good. They duplicated how the above OEM harness gets its power from the wiring in the main harness that goes to the rear end harness. The installation is the same for either the factory or the Hopkins, pull out the right rear corner, unplug rear end harness and plug in trailer adapter inline, fasten ground wire to the ground bolt back there or install a self tapping screw for the ground wire, and then push the wiring down through the floor grommet.

http://www.etrailer.com/p-42475.html

The only difference is the factory one has the correct rubber piece on the harness to go into the floor grommet hole, you pull out the plug and then push the wiring into it. If you use the Hopkins all you have to do is make a slit in the factory hole plug and then push it down through and put a little RTV across it to seal it back up.

Now on the other hand if you need a 7 wire harness, your trailer has brakes, then its different. Also the Hopkins and the factory one are only rated for minimal lighting, for example rear tail/turn/brake lights, and a couple side markers and license plate light on the running lights circuit. Anymore than that and they will dim down a bit.

If you have more lights than that your going to have to go with a heavier powered adapter and run a new power wire forward to the battery.

The dealership i deal with recommended the 7 wire harness from Mopar parts that has the fuse holder and harness that goes forward for battery power. The part number for that is 82210642AD, but after looking how it installs and how much you have to take apart to plug in everything i said the heck with it.

http://www.libertypartsstore.com/product_info.php?products_id=1294

You could get the same performance as the factory 7 pin version from an aftermarket one that would only require plugging it in and running a power wire forward.

I did a lot of research on this when i installed the hitch on my 03'. The 42475 from Hopkins is what i used and it works well, it pulls power from the rear power outlet circuit through the main harness plug, i know this because when i pull the fuse for that outlet the trailer lights go out also.

 

[kb0nly]

The plug and play one, aka the T-connector harness, is fine for a trailer that only has 2 lights. But if you plan on pulling a trailer with multiple lights, side markers, etc, go for the Modulite protector harness. It's a powered harness that offers more amperage to run more lights.

X2...

The Modulite is a very good and reliable aftermarket adapter which can be had in powered versions to handle as many lights as you want to provide for. They have different versions rated for different amperages.

The only bummer, cutting and splicing all the wires because they don't make one with the correct plugs for the Liberty. Its basically the same as the Hopkins 42475 but they use heavier current diodes or relays depending on the model and then run a heavy gauge wire from the back to the battery. And you have to tap into the wires at that rear plug where the other types plug in.

I mean its not that big of a deal for someone experienced with electrical work of this type but its not plug and play.

Someone needs to offer a pigtail, like the vehicle side of the Hopkins unit, just the plugs with a chunk of wire on it, so a guy can plug that in and splice that to a powered adapter. If my Hopkins ever burns up i will just chop off the wiring to keep the inline plugs and then wire a new adapter to that and run a wire to the battery instead.

The Hopkins 42475 is rated for 8 Amps... So if you need more than that, like a big trailer with a lot of marker lights, then go modulite.

 

[seeingwhite]

82207290 02-07 Liberty Four Pin Plug Towing Harness

http://www.libertypartsstore.com/product_info.php?products_id=213

The link is the best price i have seen on them. However, its wired the SAME as the Hopkins 42475. Which costs less and works just as good. They duplicated how the above OEM harness gets its power from the wiring in the main harness that goes to the rear end harness. The installation is the same for either the factory or the Hopkins, pull out the right rear corner, unplug rear end harness and plug in trailer adapter inline, fasten ground wire to the ground bolt back there or install a self tapping screw for the ground wire, and then push the wiring down through the floor grommet.

http://www.etrailer.com/p-42475.html

The only difference is the factory one has the correct rubber piece on the harness to go into the floor grommet hole, you pull out the plug and then push the wiring into it. If you use the Hopkins all you have to do is make a slit in the factory hole plug and then push it down through and put a little RTV across it to seal it back up.

Now on the other hand if you need a 7 wire harness, your trailer has brakes, then its different. Also the Hopkins and the factory one are only rated for minimal lighting, for example rear tail/turn/brake lights, and a couple side markers and license plate light on the running lights circuit. Anymore than that and they will dim down a bit.

If you have more lights than that your going to have to go with a heavier powered adapter and run a new power wire forward to the battery.

The dealership i deal with recommended the 7 wire harness from Mopar parts that has the fuse holder and harness that goes forward for battery power. The part number for that is 82210642AD, but after looking how it installs and how much you have to take apart to plug in everything i said the heck with it.

http://www.libertypartsstore.com/product_info.php?products_id=1294

You could get the same performance as the factory 7 pin version from an aftermarket one that would only require plugging it in and running a power wire forward.

I did a lot of research on this when i installed the hitch on my 03'. The 42475 from Hopkins is what i used and it works well, it pulls power from the rear power outlet circuit through the main harness plug, i know this because when i pull the fuse for that outlet the trailer lights go out also.

Thanks for the link for the Hopkins. My only concern is from the instruction for the hopkins wiring harness. The instructions say that you need to run the 12v power wire from the adapter all the way up front to the battery. Is this really the case? I didn't see that requirement in the instructions for the OEM part.

Thanks.

 

[kb0nly]

Thanks for the link for the Hopkins. My only concern is from the instruction for the hopkins wiring harness. The instructions say that you need to run the 12v power wire from the adapter all the way up front to the battery. Is this really the case? I didn't see that requirement in the instructions for the OEM part.

Thanks.

No you don't...

Thats the old version, eTrailer unfortunately doesn't have the new version of the instructions. It just plugs inline with the large OEM harness plug and then a ground wire to the body.

And actually the OEM version, if its a 7 pin, does have a power wire that runs to the front. The 4 pin OEM version is the same as the Hopkins, just plugs in and takes power from the rear power outlet.

I also noted a little while back on another forum someone was asking why their trailer lights weren't working, i asked what they had for a harness and they have an OEM harness, so i told them check the fuse for the rear power outlet, low and behold they had blown that with a portable cooler the day before.

So the OEM uses that circuit as well.

 

[seeingwhite]

No you don't...

Thats the old version, eTrailer unfortunately doesn't have the new version of the instructions. It just plugs inline with the large OEM harness plug and then a ground wire to the body.

And actually the OEM version, if its a 7 pin, does have a power wire that runs to the front. The 4 pin OEM version is the same as the Hopkins, just plugs in and takes power from the rear power outlet.

I also noted a little while back on another forum someone was asking why their trailer lights weren't working, i asked what they had for a harness and they have an OEM harness, so i told them check the fuse for the rear power outlet, low and behold they had blown that with a portable cooler the day before.

So the OEM uses that circuit as well.

Great news, thanks.