To troubleshoot, you'll need to consult your 1999 Lincoln Town Car's owner's manual. It will have a fuse box diagram showing all the fuses and their corresponding circuits. Look for fuses related to the power distribution for the body control module (BCM) or possibly the instrument cluster, as the cruise control often interacts with these systems. A blown fuse in those circuits *might* affect the cruise control, but it's not a guaranteed fix.
Instead of focusing on fuses first, start by checking:
* The cruise control switch itself: Make sure it's not malfunctioning.
* The brake and clutch switches: These are safety interlocks; if they're faulty, the cruise control won't engage or will disengage unexpectedly.
* The vacuum system (if applicable): Some older cruise control systems use vacuum. Check for leaks.
If you have checked these and still suspect a fuse, carefully examine each fuse in the relevant sections of the fuse box diagram provided in your owner's manual. If any fuse appears blown (broken filament), replace it with a fuse of the *exact same rating*.
