Factory wiring for brake controller - Nissan Xterra Forum
 
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post #1 of 9 Old 07-20-2014, 04:35 PM Thread Starter
ccnvweb
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Factory wiring for brake controller

Just took delivery of a 2014 Pro-4x that had the "Nevada Tow Package" factory installed.

Using Tekonsha's Nissan adapter cable, hooking up my Prodigy brake controller was easy. But, I was astonished to find that the controller is always on, even with the key out of the ignition. The factory wiring has the 12 v supply to the controller (yellow wire in the factory connector) always hot. Shouldn't this only be hot when the key is accessory or on?
Did the factory screw up the wiring?

Jon in Nevada
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post #2 of 9 Old 07-20-2014, 08:59 PM
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I haven't really had time to dig into this further, but I am looking just so you know. I have the Nevada Tow Package on my X, but I don't run a controller.

Which Tekonsha unit do you use? Are you using their proportional wiring adapter?

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post #3 of 9 Old 07-20-2014, 09:45 PM
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FYI I installed a brake controller on my work truck (diesel towing machine) using the Tekonsha wiring harness and a higher end Tekonsha brake controller and it is always on. It goes into battery save mode after a while and hasn't given us any issues.

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post #4 of 9 Old 07-20-2014, 11:46 PM Thread Starter
ccnvweb
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Thanks for the replies.
My issue is not with the Prodigy P2 controller nor the Tekonsha 3050 P harness connecting to the factory tow package connector, but rather the factory wiring.

I don't understand why the 12 v supply to the factory connector (Yellow wire) is always hot. Seems like it should be only hot when the ignition key is in the accessory, or even better, on position.
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post #5 of 9 Old 07-21-2014, 04:25 AM
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Many controllers use constant hot, so that in the event of an emergency where you have to turn off the IGN real quick, you still have brakes on the trailer.
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post #6 of 9 Old 07-21-2014, 09:07 AM Thread Starter
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OK Creepy, I guess that makes sense, thanks. I think I'll install a cut-off switch so I can leave the controller in but not on when I'm not towing.
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post #7 of 9 Old 07-21-2014, 09:11 AM
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Originally Posted by ccnvweb View Post
OK Creepy, I guess that makes sense, thanks. I think I'll install a cut-off switch so I can leave the controller in but not on when I'm not towing.
Why are you worried about the controller being on? I have had mine installed for 140000 miles now with the stock wiring and haven't had any issues.


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post #8 of 9 Old 07-21-2014, 09:19 AM
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I had a Hayes Lemmerz controller on my Dodge that was always hot. The installation manual actually required a self resetting circuit breaker on the "constant hot" wire. I never had any problems with it.

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post #9 of 9 Old 07-21-2014, 10:08 AM
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I checked the installation manual for both your controller and your harness. It seems to be "plug-n-play" and fairly simple. I found no wiring diagram for your controller...just a reference to a separate generic wiring installation guide which I never found (I guess they want you to use the harness).

Your manual states the controller goes into power saving mode after 15 minutes. The screen will go blank. There's no need to install a switch.

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