Just so you all know the issue: As described, if you simply wire diodes inline with the stop and turn Yukon/Tahoe wires connected to the Esky common stop AND turn, then whenever you have the stop lights AND turn signal on at the same time the stop will override the turn and the light will be on continuously. All the diodes do is block current from leaching into each other's circuit.
I did talk to Mark about this and he was going to look at an Escalade this weekend to figure out how he previously did it on the Tahoe. I have the Esky lights in my posession. In bench testing them with a 12volt supply, I only get the stop/turn double rows of LED to illuminate when applying voltage to pin "B".
Therefore, unless there is some signal coming off pin "A" to cause the Esky circuit board (in the light housing) to differentiate between the solid on "Stop" condition and the flashing "Turn signal" condition we will have to create an external circuit to do this.
Unless Mark can come up with a better way, a cheap fix to this is to simply wire up a 5>4 trailer harness converter to take care of the 2>1 signal issue. These also contain blocking diodes as well so it possibly kills two birds with one stone.
