[awisewon]

I would not cut any wires anywhere. Its strange the trunk lid opens soon as you put the car in drive. I would first look for broken wires disconnected wires to any harness. I'd also look at the trunk open in the drivers door pull it out and look for any broken or burnt wires. Also the fuse boxes one under the dash and under hood but first get the diagrams and look to see what operates the trunk as far as fuses. I am just learning about the Marquis myself. I have worked on cars motorbikes 2 and 4 strokes many years but did not keep up with this modern Electronics stuff and avoided it buying only old easy to troubleshoot. But I needed a newer safer car for my family so I just bought a 1992 Grand Marquis Ls its in great shape low millage no rust even on under frame. But i just started having problems with headlights coming on and off and thought I fixed it but now it does it with blinker on cut blinker off lights come back on mine problem may be the light switch. Also I have not figured out what it is yet but there is a black box in the trunk on drivers side. I think its for the remote and key less trunk and sends the signal to the Fob to open doors and trunk. Its step by step learning and getting the diagrams and info from those who really know these cars and the Pros if push comes to shove go to the dealer and let them tell what they think is wrong. I myself still haven't figured out what the black box in the truck is yet or for sure whats causing my headlights to flicker on and off. but you may want to look at that black box in the truck and the door button switch.