Hey The other day my install mate & I
did a Sick 08' Expedtion
We installed Boston Pro's Ront & rear
Boston G1 8"
JL 5Chl
But We Used The Clarion Max675 II for the Nav/DVD
We Hooked the Parking Brake switch To a Pulse Timed Relay
12V Power
Ground
We used The Remote Turn On from the Hu since the new Ford did not have Acc
We set the delay for 16sec.
It worked awsome & now we did not need to use a switch to get the DVD to play
It was sweet..
So if you need somthinlike that its just a thunk about for your ride..
peace troy