Where is the inertia switch on a 99 Lincoln Town Car located at in the trunk

Push the button . it's called inertia fuel shut off switch .
Inertia Fuel Shut-Off Switch C466
Front of trunk, on LF side of rear package tray support

On a 2003 Lincoln Town Car, the fuel pump shut off switch ( inertia switch ) is in the trunk , on the drivers side

Locate Inertia Fuel Shutoff Switch--in trunk on left side of rear package tray support and depress reset button (on switch)

Usually the Ford products have an Inertia switch which cuts off the power to the fuel pump. On some models, this switch is in the trunk right next to the Air-ride control. It has a button which just needs to be reset and then all is good.

If you can't find the switch in the trunk, it should be around the front floor kick panels.

Look on the Web for more info, just use 1995 Lincoln Town Car inertia switch in the search header.

Often this is the Inertia switch causing this. Look in the trunk next to the Air-ride switch. There is a reset button on the Inertia switch. Just press the rest and try to start the car.

I will try to give you 2 sets of senarios depending on whether it cranks over or not.

There is a safety switch on the Brake pedal which sends a signal to the Brake lights and a starter circuit. If the Brake lights do not light up with a foot on them, then a starter signal will not go through either.

Look under the Driver's dash for the Brake switch on the Brake pedal lever. It could be broken of pushed out if place.

Cranks but no start. The Inertia switch is common problem. It can be located in the trunk or behind the kick panels of the front floor. It has a reset button to push.

Loss of fuel pressure. After checking the Inertia switch if you still have no fuel pressure the pump may be bad.

Now there are other reasons like a dead battery, bad starter, etc.

We need more details to supply additional answers.

Do you have spark? Did you try a little starting fluid? Is this a 4.6 or 5.0 ? The inertia switch is typically in the trunk at the very back of the car near the tail lights and is covered with the trunk liner. but they do not usually go bad from just sitting around, they require an impact!

The inertia switch should be located in the trunk, on the right-hand side, behind the feltlike trim material.

Check just above the carpet on the passenger side where your feet go under dash.

fuel pump inside fuel tank accessed by removing plate on forward facing tank panel.
Inertia switch is inside boot/trunk
Ign module is plugged into side of distributor.
The coil is a standard 12 v ignition coil.
The ecm is located projecting through the bulkhead (firewall) by the drivers feet.
You can access the trouble codes with a scanner plugged into the socket in the engine compartment drivers side or by counting flashes of light on a 12v testing light as described in the Haines Manual