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Testing the T-One Wiring Harness # 118258 on a 2009 Hyundai Santa Fe Limited


Hi! I read the installation instructions, 118258-037 Rev A 05/10/2010 intended for my 09 Santa Fe Limited, but still have questions on a WARNING: Test and verify installation with a test light or trailer once installed. For initial test, reset vehicle electrical system by temporarily removing the key from the ignition... Q1. How can I test with a test light? Can a test light set up be done easily? Q2. A feedback from a user, not sure if his SUV has the factory tow package or not, suggested the tow package needs to be activated, presumably by a dealer? Can you confirm whether my 09 Santa Fe Ltd still needs such activation, as suggested in the installation instructions, or not? Q3. If I still need to activate the tow package by resetting the vehicle electrical system, removing the ignition, assuming when the engine is running in Park, can be a problem that the dealer may claim voiding the warranty? I dont have a trailer to test now, prefer to test in advance though. Thanks!


Helpful Expert Reply:

Using a test light to test your T-One Wiring Harness, # 118258, on your 2009 Hyundai Santa Fe Limited is a fairly simply process. To test the trailer connector, you will need a circuit tester with an incandescent bulb like # PTW2993. These testers can also be found at many hardware or auto parts stores.

I have attached a video of my coworker demonstrating how to test a 4-way trailer connector using a circuit tester for you to check out.

When a vehicle comes with a tow package, it typically comes with a trailer hitch, trailer wiring and sometimes other items such as a transmission cooler. If your vehicle did not come with a tow package, then there may be additional fuses and relays that will need to be installed in the fuse box for the tow package. I recommend contacting a Hyundai dealer with your VIN. They should be able to tell you if your vehicle came with a tow package and if not, they can provide you with the proper fuses and relays to activate the tow package wiring.

Resetting the vehicles electrical system is basically just turning your car off, removing the key from the ignition and then turning the car back on. You will not remove the ignition, you will just remove the key from the ignition. This should not void your warranty unless the wiring harness was installed incorrectly and was the cause of any damage that occurs.

helpful expert reply by:
John H

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