Originally posted by: nourdmrolNMT1
here we go.
check out
http://www.crutchfield.com to get a general overview on products on the market.
then go and look for prices over at
http://www.ikesound.com
http://www.sounddomain.com
http://www.thezeb.com
http://www.etronics.com
and when you install the head unit this time use security screws which will deter theft a decent amount.
they can be found at
http://www.partsexpress.com
also, i am assuming that the grand marquis has airbags. if it does not, neglect this next statement.
and airbags wire is covered in yellow heat shrink.
go to your local auto store, buy some yellow electrical tape (might not be at the auto store, maybe online onle)
cover every wire from the headunit in yellow electrical tape as far as you can see.
then bundle the wires together, tape them in about identicle sizes as the yellow airbag line. then put a colored mark on every set of wires.
I.E. red, green, blue are for the radio, purple is the airbag. now run the wires as hidden as you can over to the airbag area, and then have them visible. make the marks in the area near the air bag.
now if you want to get serious. go for alarms, but that isnt necessary from what you have described.
MIKE