I spoke with my contact at Curt about the Wiring Harness, # C55373, on your 2000 Lincoln LS. The good news is that there is nothing wrong with the wiring harness. What is happening is that on your model vehicle (and a handful of others) there is what is called a battery saver mode that kicks in about 20 minutes after the vehicle has been turned off. With the trailer connected, it thinks that it still needs to deliver power and that will cause the light to light up on the trailer.
My... view full answer...
If you have no light signals at all at your 4-pole connector (no turn, tail or brake lights) then either the powered converter in this harness may have been damaged in the first installation effort, there is a faulty 12V input power connection to the converter, a bad ground connection or there is a problem within the wiring in the vehicle or trailer.
The installation instructions are included in this email in case you no longer have the original printed copy. I have also linked an article... view full answer...
The wiring harness we offer for your 2000 Lincoln LS is part # C55373 from Curt, it has a 12V power wire that needs to be run up to the car's battery to deliver the actual power for the trailer lights. The Curt harness you referenced, part # C56160, works the same way, although it is NOT a confirmed fit for your 2000 Lincoln LS (it fits the MKX only). Hopefully this is not the harness that was installed.
Based on the (very) odd behavior of your trailer's driver-side brake light, it sounds... view full answer...
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