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· Registered
2004 CTS-V
52 Posts
No. If you piggybacked off of the signal wire at the bulb, your amber LED will run when the DRLs are on. You wouldn't have any white. The switchback works by making the amber LED the priority. OP stated that in the first post. So, any time the amber LED gets current to it, the switchback turns off the white LED and turns on the amber. If you piggy back at the bulb, the signal wire will be getting current while the DRL is on, thereby giving the amber LED current. The switchback would then give the amber LED priority and you would have an amber light constantly on.

You would have a similar problem with the side markers because those are turned on when the headlights are on, so you would have your amber LEDs running anytime the headlights are running. You need a wire that has current through it ONLY when the signal is flashing.
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