* Under the hood: You'll likely find modules related to engine control (though less sophisticated than later ECUs), ignition, and possibly charging system. These might be relatively small, black boxes attached to the engine or firewall.
* Under the dash: Modules controlling things like the instrument cluster, climate control, and possibly some aspects of the power locks or windows might be located here. These would often be tucked away, sometimes behind the glove box or under the dash itself.
* Trunk: Some less common modules related to body electronics or security might reside in the trunk.
To find specific modules, you'd need a wiring diagram for your 1985 Town Car. These diagrams show the location of all the modules and the connections between them. You can find these diagrams online through various automotive parts websites or forums specializing in classic Fords. You may need to specify the engine size (e.g., 5.0L V8) when searching for the appropriate diagram.
Without a wiring diagram, pinpointing specific modules will be difficult and time-consuming. Be prepared for some detective work involving careful inspection under the hood, under the dash, and in the trunk.
