This sounds like as you have explained the removal of the factory fitted stereo is connected to the controls/ steering column by fitting the new stereo some electrical items remain unconnected. The volume control may be in circuit.
I have experienced this before on other models when fitting non factory extras.
SOURCE: Cruise control on my 96
I dont know if they had it in 96 but there is something called a speed control deactivation switch. Maybe check your owners manual about that.
SOURCE: 1988 Ford Crown Vic Lost Cruise Control
Although I don't think the cruise is an issue for safety, reach in under hood , or in grille area and find your horn(s) and just pull the connector off them temporarily, so they won't blow & put fuse back in and see if cruise starts to work again. It's not unusual for circuits to be labeled wrong or not at all in fuse panels. Then you can turn your attention to horn problem.
Testimonial: "Thanks for the help! and especially checking back in. However i didn't find out about it until now. Horn was a broken switch, all power on #17 fuse."
SOURCE: 1993 crown vic horn/cruise control won't work
Check the fuse for your cigar lighter/horn. I've seen the fuse blown from the lighter shorting. It will caue the cruie not to work also. I hope this helps. Good luck.
SOURCE: 1999 FORD CROWN VIC. 4.6 - PROBLEM, NOISE
This is caused by the IAC valve. Over time the valve becomes gummy and inoperative. Get it replaced and the problem is solved. IAC stands for idle air control, hence the stalling concern.
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