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post #1 of 31 (permalink) Old 04-09-2015, 04:51 PM Thread Starter
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Is there a trailer prep fuse?

I installed a T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector 118258 on my 2009 Santa Fe GLS with factory trailer prep. Initially after installation I hooked up a trailer and everything worked, but now I don't get any lights at all. This is a long troubleshooting story so I will cut to the real question.

The technician at etrailer.com said that there is no power going to the converter box from the car's towing wires. I can confirm this with my wire tester. I get signals (running lights, flashers, etc) but the converter box needs power in order for the harness to work.

My question is whether there is a fuse in the fuse box that powers the trailer prep? Or some kind of electrical short override that resets?

Please no responses about grounding, that's not the problem here.

Thanks for your help.
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post #2 of 31 (permalink) Old 04-09-2015, 07:30 PM
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mindseye
On my 2011 Limited, there is a fuse in the rear cargo area, on the left hand side behind one of the removable panels. It is a yellow (I believe) inline fuse.
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post #3 of 31 (permalink) Old 04-09-2015, 09:32 PM
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On the '09, IF we're talking about the standard 4 pin plug, no separate fuses. Each of the 4 powered wires goes directly back to something in the harness for the existing lights.

1 = Blue = left 'stop' lamp (operates 2X on trailer)
2 = Pink = right turn lamp
3 = White = left turn lamp
4 = Green = left 'tail' lamp (operates 2X on trailer)
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post #4 of 31 (permalink) Old 04-09-2015, 09:59 PM
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Just out of curiosity, how did you establish that no power exists on the connector for any of the lights? Where did you stick the 'other' lead?
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post #5 of 31 (permalink) Old 04-12-2015, 10:36 PM
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I have a similar problem on my 2010. All trailer lights were working fine and the next time around, no power to the flat plugs on the car.
All fuses, under the hood and near the steering wheel are all fine. (I couldn't checked the squared one...) The lights on the Santa Fe work as usual.

The harness seemed to be factory installed and before I remove the rear bumper to access the converter box, I would like to know if there is a fuse somewhere else.

Any suggestions?
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post #6 of 31 (permalink) Old 04-13-2015, 09:42 AM Thread Starter
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There are 2 harness plugs. The first one is for the signals (white, brown, yellow, green). The second plug supplies power to the converter box. I tested for power on the cable. The eTrailer.com tech said I have to have voltage there to power the converter box. Without that power, the whole system shuts down.
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post #7 of 31 (permalink) Old 04-13-2015, 09:53 AM
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If it was working initially you likely blew the fuse protecting that circuit. The trailer may have a wiring problem or a line is shorting somewhere. Trailers are notorious for issues because of there exposure to abuse and the elements.


Not having the trailer plugged in but a tester in the flat four would be best to eliminate I blowing again if that's the case. It is possible the converter is blown or faulty as I have seen new ones not working or intermittent. If the blown fuse is located and it blows again on its own the converter is taking it out and back you go the installer. He could have verified that for you quickly since there wasn't power. Mickey mouse outfit no doubt.

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post #8 of 31 (permalink) Old 04-13-2015, 09:56 AM Thread Starter
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Update: Thanks for all of the suggestions so far.

I re-seated all of the 10 amp fuses in the fuse box and it all started working. While it was working I tested voltage in various places. I found that I now had voltage on the wire that feeds power to the converter box, which is what I suspected my problem was.

Sadly, it only worked for a short while and stopped working again. Once again as suspected, the power on the wire feeding the converter box went away.

I completely believe at this point that I am losing power from the car (trailer prep) that is supposed to feed the converter box. If I can determine where that power is coming from, I could figure out why I keep losing it.

I may eventually run a separate 12 volts to it, but I'd rather fix the problem and not bypass it.

I would like to get my hands on the wiring diagram for the trailer prep.
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Last edited by Richard Tracy; 04-13-2015 at 10:07 AM.
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post #9 of 31 (permalink) Old 04-13-2015, 10:18 AM
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The owners manual has a chart for the fuse assignment. Seating and visually looking at fuses doesn't always work. You need to meter the in & output voltage at the fuse. If its faulty or blown you would not see 12V at each side. Anything else is guessing. Once you cut wires underneath you'd be opening up a whole new set of problems, corrosion primarily.

2008 Sante Fe AWD Limited
3.3L Engine 88,xxxkm purchase
Currently 135,000km Nov. 2016
CLASS III CURT Hitch
Bright Yellow 893 Fog Lights
(South of Belleville)
Prince Edward County, ON, Canada
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post #10 of 31 (permalink) Old 04-13-2015, 10:46 AM
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When the trail or flat four is dead. Are all the vehicle lights working?
Running lights
left/right signal lights
4 way flashing?

2008 Sante Fe AWD Limited
3.3L Engine 88,xxxkm purchase
Currently 135,000km Nov. 2016
CLASS III CURT Hitch
Bright Yellow 893 Fog Lights
(South of Belleville)
Prince Edward County, ON, Canada
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