Adjust the stricker whichever way it need to go.
on the latch there are two small bolts loosen them and move the latch up then retighten
Check the hinges on the door. They probably need replacing. Open the door and then lift it and see if there is free play in the hinges. There should not be. The latch itself is adjustable so if it is only slightly off, you may be able to adjust it enough so it will latch. You will need to loosen the latch and adjust it even if you replace the hinges.
Almost all car doors adjust the same way, by adjusting the bolt or u latch on the door post. The part the lock catches on. Some have 2 bolts, some are the bolt itself. Just loosen the catch and move it in a bit.
The door ajar switch on a 1993 Mercury Topaz is located in the door latch. The switch is triggered by the top hook of the latch. If the problem is having to frequently slam the door a second time to make the seat belt work, try to adjust the striker bolt attached to the door frame up a bit. Works for me.
you just have to push up on the latch
Usually if you loosen the screws on the latch receiver mounted on the cab edge, the latch can be shifted up/down or front/back.
IF YOU LOOK AT THE DOOR WHERE THE THREE SCREWS ARE, IS EVERYTHING STRAIGHT OR IS THE LATCH IN SLIGHTLY? (1/16" WILL MATTER) IF YOU GET IT OUT WHERE IT NEEDS TO BE IT SHOULD CLOSE AND LATCH. (WHEN IT IS IN TOO FAR THE LATCH HITS THE LOOP AND THE DOOR WON'T CLOSE) ALSO CHECK TO SEE IF THE SHEET METAL HAS CRACKED BY THE HINGE, CHECK THE LOWER ONE, THIS WILL NEED TO BE WELDED.
lift door handle, using screwdriver, move latch forward....will open
buy a new oneANS 2 - You can always adjust the strike plate OR the latch so they meet properly.
Pull the INSIDE handle as if you were going to open the door and then use a flat blade screwdriver ( or any screwdriver ) to move the latch sections apart
put a new latch in If the car has been setting for a while I would start by spraying some wd40 on the latch mechanism ,if that don't help try adjusting the striker and the door alignment Get the door open, pull the panel, adjust latch manually to diagnose or if replacement is needed
hot water