This is a hard one to answer without a diagram. Please see the related links area for a diagram of the firing order and plug wire routing.
You could also replace one wire at a time to avoid the problem.
on 1991 ford taurus 3.8 how do you replace a timing cover
autozone.com has online manuals that give you all that info
One at a time.
help me locate fuse box ford taurus 1991
The firing order for the 3.0L SHO is 1-4-2-5-3-6
Only the AODE that came with the Taurus.
Assuming it is getting fuel and you have no spark, replace the ignition module.
Check the firing order which is 1-3-4-2 , if it is correct you may need to have a wet and dry compression test to check the condition of the valves, rings etc.
Disconnect the 1991 Regal battery. Remove the alternator belt and wiring. Unbolt the alternator and install the new one. Reconnect the wires, install the belt, then reconnect the battery.
What you need to do is open the trunk. Then you need to remove the liner in the back of the trunk closest to you then you can see the wires the twist out.
For a 1991 Ford Taurus : According to my Chilton's Auto Repair Manual : ( 16.0 U.S. gallons or the optional extended range tank which is 18.6 )
TWO wires