FM MyA.

When one side is hot, the other is not.
The vibrator operates off the difference between the two.
So each side sometimes as acts as a quasi ground, even though its not.
If you want to use a proper ground, then you can use two small diodes. One for each signal wire, tied together and connected to one side of the vibrator. The other wire goes to ground. This way you can add a small relay triggered by your brake light.
With the brake light triggered relay, when you have the brake on, the blinker buddy looses it's ground line, stopping buzz bottom while stuck in intersections!
Good luck
Glenn
ps. I have done this on my Interstate and it works nicely.
