I'm sure we're all familiar with the annoying "grey out" of the buttons on the navigation when the vehicle is moving. Or not allowing the DVD to play on the front screen unless vehicle is stopped and e-brake is engaged.
I know then that the fix will have something to do with a speed wire and brake wire to the radio. (Grounded out or something? How?) Somebody told me about a DPDT switch, but what connects to what?
Thanks for the help!