Trailer Lights not working fully - Nissan Titan XD Forum
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post #1 of 5 Old 02-17-2017, 12:06 PM Thread Starter
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Exclamation Trailer Lights not working fully

Whenever I connect either plugs for a larger trailer or the smaller lights.

The truck is only allowing the lights to turn on. No brakes, no turn signals, hazards or anything work.

Any clue why?

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post #2 of 5 Old 02-18-2017, 12:14 PM
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I suggest you pick up one of these troubleshooting lights that has a clip at one end to establish a ground and pointed end to probe connections. Also download a wiring diagram for the the type of receptacle you have (tow vehicle side) and probe the pins on the receptacle. The pin positions are standardized but the actual wiring colors can vary somewhat. The trailer plug side will be a mirror image of the tow vehicle receptacle.

If the truck receptacle shows ok, the problem is with the trailer plug or further back with the trailer wiring/bulbs. For a factory mounted tow pkg, I would expect the truck to be ok, but a wiring issue in the trailer might have taken out fuses for turns/hazards and/or brakes causing you not get the correct response from the truck. The permanently molded trailer plugs tend to be more reliable than those that can be replaced. The replaceable ones require care when rewiring. Tight quarters for wiring, can break internally and easily short inside and take out tow vehicle fuses.

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post #3 of 5 Old 02-18-2017, 02:22 PM
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Someone had this same issue recently and turned out to be a fuse. Believe its located under the hood on the right side.
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post #4 of 5 Old 02-18-2017, 03:04 PM
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I would hope he would check the fuses first and then get the test light! Will help if the fuses/truck receptacle are OK! Good to start learning this stuff. Much cheaper than shop labor rates!

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post #5 of 5 Old Yesterday, 12:58 PM Thread Starter
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Quote:
Originally Posted by JB'sTitanXD View Post
Someone had this same issue recently and turned out to be a fuse. Believe its located under the hood on the right side.
I'll try and locate this..

Quote:
Originally Posted by mytpro4x View Post
I would hope he would check the fuses first and then get the test light! Will help if the fuses/truck receptacle are OK! Good to start learning this stuff. Much cheaper than shop labor rates!
Going to check today. I know its not the trailers as I have seen them working on other trucks, it has to be the truck.

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