On the wiring diagram is CB is which "+" or "-" on the coil. My car is positive ground. Kenny 61 BT-7 _________________________________________________________________ Windows 7: It works the way you want. Learn more. http://www.microsoft.com/Windows/windows-7/default.aspx?ocid=PID24727::T:WLMT AGL:ON:WL:en-US:WWL_WIN_evergreen2:102009