This might work for you guy's replace the brake light switch Easy step by step tutorial watch the video. im sure it will help. MERCURY MARQUIS STUCK IN PARK http://youtu.be/fgUn1TuHu-0
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My van wouldn't shift from park into gear in the parking lot at work. I had to have it towed. They replace the switch that is spring-loaded to the brake pedal. When you press down on the pedal, that switch pops out and allows you to shift gears. In this case, the spring didn't release so the van wouldn't shift out of park. They replaced the part but I still had the same problem (did they really replace it?). I took the part out, sprayed with WD40 and it's been working great for years.
I'm going to say something happened to the cable between the shifter and the transmission. There is a switch on the transmission that prevents you from starting the engine in anything other than park or neutral. The transmission is probably in reverse or drive which would allow it to roll. Someone would need to check the lever on the trans where the shift cable is attached.
check your brake light switch for proper adjustment as wel as the electrical connection at the switch also check your fuses and make sure your brake lights are working
Shift - interlock system problem .
Automatic Transmission Shift Lock Control System
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of PARK position. The system consists of the following components:
• The automatic transmission shift lock control solenoid
• The automatic transmission park lock solenoid
• The automatic transmission shift lock control switch
• The transmission range switch
With the ignition in the ON position, battery voltage is supplied to the automatic transmission shift lock control switch. The circuit continues through the normally-closed switch to the automatic transmission shift lock control solenoid. The transmission range switch provides a path to ground for the automatic transmission shift lock control solenoid in the PARK position. With the automatic transmission shift lock control solenoid energized the shift lever is mechanically locked in the PARK position. When the driver presses the brake pedal, the contacts in the automatic transmission shift lock control switch open, de-energizing the automatic transmission shift lock control solenoid. This allows the shift lever to move from the PARK position. When the shift lever is out of the PARK position the controlled ground contacts in the transmission range switch open. This prevents the automatic transmission shift lock solenoid from energizing when the vehicle is out of the PARK position.
Gday mate,geoff here, now on your shifter if column shift there is an adjustment where it goes down the box from the steering column under the hood and if stick shift should be just under the console, alternitiveley the rubber grommets on the linkage are worn and need replacement, some fuel hose will surfice here if the grommets are unavailable at the parts counter, hope this helped, geoff.
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