The T-One Vehicle Wiring Harness # 118492 should not affect the ability of your 2011 Nissan Cube's cruise control. As the harness only connects with 2 connectors you will want to simply remove the harness to confirm the issue is only caused by the harness. If you find the system still does not function properly there may have been an overload on one of the cruise control circuits which is causing the issue.
If the cruise control works as normal there may be an manufacturer error in the... view full answer...
The first thing you will want to do is test the 4-way of the # 118492 that you installed with a circuit tester like part # PTW2993. See the video I attached to see how this is done. This will tell you if the problem is on the vehicle side or trailer side of the wiring.
I suspect the problem is on the trailer and it is that the grounds of the light assemblies aren't strong enough. Check to make sure the assemblies are grounded to a clean metal surface. Do the same for the main ground wire... view full answer...
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