How to Determine if 2005 Nissan Frontier has Tow Package for Installing Trailer Wiring

Updated 09/14/2020 | Published 05/15/2016

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Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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Question:

I bought a used frontier and want to hook up trailer lights, but dont know whether it is tow ready. How can I tell? Thanks

asked by: John B

Expert Reply:

The pin needed to install the # 118263 will be on the frame of the truck, but what matters most is whether or not the rest of the tow package wiring will be present.

You would need to remove the passenger side kick panel to the right of where a passengers right foot would be. If there is a harness plugged in there that looks like what's picture then all you would need is the # 118263. If not you would need the part # C56225 instead.

expert reply by: Jameson C

click to enlarge

Ray

9/8/2020

I have a 2007 Nissan Frontier Crew Cab LE 4X4 with factory 7pin trailer receiver. 1) Do I still need the relays that come with part # 118525? 2) Are these relays sold separately without the 4 pin flat wires that come with part # 118525? 3) My trailer wiring has a 4 pin flat that I need to connect to my truck's 7way receiver.

Jon G.

9/11/2020

If you have the factory 7-Way on your 2007 Nissan Frontier then the relays should already be installed. You actually should just be able to disconnect your 7-Way from the wiring and then connect the round US Car Connector the Hopkins # HM40975 so that you can use either a 4-Way or 7-Way whenever needed.

Ray

9/11/2020

@JonG I just saw that I am missing one of the 3 relays that come with part #118525. I am missing one of the blue relays so I just ordered it. Do all 3 relays need to be plugged in for the trailer lights to work?

Jon G.

9/14/2020

@Ray I'm not quite sure what functions each relay is for but it's very possible that not using one of the relays could cause the whole harness to not be receiving/sending out power.