My mercury cougar won't start, all lights are ok

This is wiring for shift interlock. Some makes and models have a bypass button close to shifter in order to bypass shift interlock. I don't know if your vehicle has that button or not? I looked at info for 6 cylinder.

could be worn ignition swtich.check battery and connection

check battery connections for corrosion and see if they are loose by trying to twist the terminal if loose or corroded there is not a good connection to battery if corroded then simply use baking soda and water if no baking soda use coca cola.ok turn your key into run position leave in run pop hood take a screw driver or key to starter solenoid on fender by using a metal tool touching the two connections together hold and see if it starts hold for only max of 5 second bursts if it does ignition switch is bad

Have you ran an Oil pressure test? low oil pressure (20lb)or no oil pressure(0lb)and the lifters will not open the valves enough to let fuel in to the cylinder to start your engine!

Mercury Cougar 1983 to 1997 Factory workshop Service Repair Manual Hi,I suggst, this will help you.

i would say its a bad connection on the battery,does the lights dim when you try starting or does everything seem normal,take a good look at the battery termanals i think you have aloose wire.please rate this answer.adrian,,,,,,,

My first suspicion is the battery connections may be lose and also the battery may now be run down. If you take the terminal connections off and clean them and the terminal posts so that they are shiny clean and charge the battery you can try again. If the car starts, that was the problem. If it doesn't, then look for the starter solenoid and lose connections there and also look toward the starter next. A tech with a volt meter can run independent checks and narrow it down further but having good connections and a charged battery are necessary to get started with the other tests.

Sounds like you have a dead cell in our battery .....buy a new battery ...before you do have the battery checked ..any garage can check it for you usually ...good luck

V6 ? 4CYL? Have you verified SPARK? Did anyone check the "fuel pump inertia switch?" Its in the right front kick panel. If it was a "Anti-theft Issue" the light would be on or flashing.

Make sure it is in P or N. You may try hitting the starter when someone is holding the key in the start position.