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How are you verifying that it goes to ground? Test light connected to 12V+ on one side and the other side to the test lead? Note that your test does not confirm that Pin2 is the connection point, only that Pin2 is connected to the connection point. The tap-in point could be anywhere along the RED/BLU.5 is perplexing. The only thing I can think of is a 3-way relay interrupting the RED/BLU wire, switching the RED/BLU (=> relay) away from the RED/BLUE (=> headlight switch) to a pure ground. This would result in one click turning the ignition on, and then no clicks from the headlight switch while the ignition remains on. But if the headlight switch was on, you could still get a click from the headlight relay when the ground is lost for a millisecond while the added DRL relay switches from the headlight-switch ground to the DRL ground.Either way, if you're sure it's going to a good ground as in paragraph 1, I'm convinced the relay must be tapping in on the RED/BLU somewhere between the headlight switch and the relay box, so follow those wires carefully. There has to be a connection in there somewhere. Under the fuse box perhaps, based on the old notes?
How are you verifying that it goes to ground? Test light connected to 12V+ on one side and the other side to the test lead? Note that your test does not confirm that Pin2 is the connection point, only that Pin2 is connected to the connection point. The tap-in point could be anywhere along the RED/BLU.
5 is perplexing. The only thing I can think of is a 3-way relay interrupting the RED/BLU wire, switching the RED/BLU (=> relay) away from the RED/BLUE (=> headlight switch) to a pure ground. This would result in one click turning the ignition on, and then no clicks from the headlight switch while the ignition remains on. But if the headlight switch was on, you could still get a click from the headlight relay when the ground is lost for a millisecond while the added DRL relay switches from the headlight-switch ground to the DRL ground.
Either way, if you're sure it's going to a good ground as in paragraph 1, I'm convinced the relay must be tapping in on the RED/BLU somewhere between the headlight switch and the relay box, so follow those wires carefully. There has to be a connection in there somewhere. Under the fuse box perhaps, based on the old notes?