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Disconnect the vehicles battery. Leave it unhooked for several hours. Reconnect the battery. This should reset the 1989 cougars computer.
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How can you start a 1989 mercury cougar with a broken ignition switch?
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Where is the amplifier in a Mercury Cougar located?
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How do you replace a front wheel bearing on a 1997 Mercury Cougar?
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Where can you find a 1989 Ford Mercury Cougar wiring guide?
Try AUTOBOOKSONLINE.COM If they don't have the wiring diagram separate they may have a shop manual
