08-03-2015, 11:56 PM
Is it a known brand, or something form China via eBay? If you mention the brand and where you got it from, someone here may recognize it as something they already purchased and be able to help.
In my experience with them they usually just work off the one ground contact wire, you may have a bad unit or one specifically made for a certain brand only, like BMW.
In my experience with them they usually just work off the one ground contact wire, you may have a bad unit or one specifically made for a certain brand only, like BMW.