I installed the Clearwater Glenda running lights today and tapped one of the purple halo wires for the relay trigger. When the ignition is turned off, the power on the halo wire turns off; no delay. Either wire is under the right speaker cover.
We installed a set of Clearwater Glenda's on a 1600GTL about a week ago. Now, I SWEAR there were no purple wires in the connector under the right speaker pod. We did identify the halo light wires, but they were not purple. We also noted some weird stray voltage on those even with the ignition off. It was 11PM, so maybe were were just imagining things?
How 'bout a photo of said 'purple' wires, if you get a chance?
We wound up fabricating a custom harness and ran the switched power lead back to the top case power. Our preference is to use the diag connector switched power lead, since it shuts off right when the ignition is switched off, whereas the top case power stays on for ~1 minute after the ignition is switched off.
I'd steer clear of tapping into the accessory power socket, though. If your lights (or even an accessory fuse panel) use a relay for 'switched power', because the relay *trick's* the accessory socket into 'thinking' that the BMW compatible Canbus battery charger is connected, causing the LED lights or fuse panel to stay on after the ignition is switched off, and you could well return to the bike with a dead battery.
Guess how we know this? We wound up replacing more than one customer's toasted battery on our dime, on account of this.