I had a porsche hitch installed on my C T and I picked up my trailer today.

My brother in law walked around the trailer to check the lights since i was getting a trailer light out warning on my instrument cluster.

Tomy dismay, the lighting is not working properly.

No brake lights, no left turn signal. I do have front orange markers, and right rear parking light and turn signal.

Could the Cayenne be wired wrong?

Does the 7 pin connector only go in one way?

 

Yes, the 7-pin connector only goes in one way.

Frequently the problem is with the ground. That problem is often coumpounded by rust.

Each lamp MUST have a solid ground. The trailer MUST have a solid ground connection from the 7-pin cable.

To get solid ground, the metal must be clean and rust-free at the connection. The wire must not be green with oxidation.

The best bet for green wire is to replace it with marine-grade pre-tinned wire, available from any marine store.

It is possible to test both the vehicle, with a voltmeter and the trailer, with a +12VDC power supply or battery. This has the pinout: http://www.pollakaftermarket.com/images/1094-WC.jpg

 

Mine has working and turn signals and brake lights but no side markers.

The dealer fault found it to the control unit.

I get the same warning on start.

Back to the dealer.

 

 

I had a similar issue with my trailer. Turned out to be a blown bulb on the trailer (one of the brake/turn signal bulbs). Once I replaced the bulb, everything worked fine.