I don't have the tow package, so this info is coming from the 2005 Colorado Service Manual, not hands on experience.
The OEM trailer connector is a four wire plug. The five inputs to the OEM converter box are: White=ground, Yellow=lt turn, Green=rt turn, Brown=park lights, Blue=stop lights. The schematic shows four output wires going to the trailer connector: Yellow=lt turn/stop lights, Green=rt turn/stop lights, Brown=park lights, White= ground.
I have heard of 7 pin connectors mentioned before, but I don't have any idea if it was OEM or aftermarket. The Service Manual only has info for a 4 pin connector.
As for bypassing the converter box, that is a good question. If the above info doesn't help, maybe you could splice into the input harness and pick up the brake light signal (Blue wire). Not sure what, exactly, is inside the converter box or what it does.
The OEM trailer connector is a four wire plug. The five inputs to the OEM converter box are: White=ground, Yellow=lt turn, Green=rt turn, Brown=park lights, Blue=stop lights. The schematic shows four output wires going to the trailer connector: Yellow=lt turn/stop lights, Green=rt turn/stop lights, Brown=park lights, White= ground.
I have heard of 7 pin connectors mentioned before, but I don't have any idea if it was OEM or aftermarket. The Service Manual only has info for a 4 pin connector.
As for bypassing the converter box, that is a good question. If the above info doesn't help, maybe you could splice into the input harness and pick up the brake light signal (Blue wire). Not sure what, exactly, is inside the converter box or what it does.
