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You don't. The switch is all one , you will have to replace the entire switch.
it is located on the light a switch that says 12sec on and off
Your brake light switch under your pedal is brobaly stuck
How do you install a stop light switch on a 1972 cougar
Why ? Just replace it.
Because your switch is bad, replace the light assembly
I was looking at the 1999 Mercury Cougar Owner Guide and it does not show that it has a gas cap warning light
On a 2000 Mercury Cougar : That's your Anti-theft system status light
There is a button on the back side of the switch that you push and hold while you pull the light knob out Forward. After this you can unscrew the hand nut either on the front or back of the switch that allows removal of the switch.
Your brake light ignition switch should be replaced. It works your brake lights and ignition switch, so you do need it. It only costs about $7 dollars.
You need an oil change.
You are low on coolant.