Ford Crown Victoria/Mercury Grand Marquis Electrical/Lighting I have an 84 crown vic and my headlights would come on and I couldn't get them to go off. Ireplaced the headlight switch and didn't help. There was a relay under the radio behind the ashtray center of dash. I removed it and took care of the problem. My auto delay doesn't work but I can live without that. Ford Crown Victoria Stereo & Radio Installation Tidbits But a crown victoria dash opening that is 1 at the front and 1 at the rear will not accomadate a radio that is 1 at both the front and back. In summary: a 1995-2002 crown vic radio will always physically fit in the dash opening of another 1995-2002 crown vic or grand marquis, a crown vic radio will also fit in most ford trucks. F100 to Crown Vic Frame Swap Ep.2 Wiring - YouTube Jan 04, 2017Thinning the wiring harnesses on my '08 Crown Vic P71 in preparation for the '61 F100 body. Thinning the wiring harnesses on my '08 Crown Vic P71 in preparation for the '61 F100 body.