A Lincoln Navigator's failure to start can be caused by a variety of factors, from electrical wiring to faulty mechanical components. By a process of elimination, you can reduce the list of potential causes and diagnose the cause of your no-start problem.
Check the battery terminals to make sure they are clean and not corroded. Use a wire brush to thoroughly clean the battery terminals. Check the terminal cables that run from the battery to the starter to make sure they are intact and not damaged. Inspect the engine bay to see if there is any shredded wiring, as this will cause electrical shorts and battery drain.
Electronic devices are a parasitic drain, and over time they will drain a battery dead. Make sure you turn off your satellite radio receiver, GPS or cell phone chargers. The best way is to make sure is to unplug all the power points in your Navigator before vacating the cabin.
The key for a Lincoln Navigator contains a microchip (passive anti-theft system, referred to as PATS) which the car needs to detect to allow the ignition to turn and activate the starter. If your key has frequently gotten wet, or the microchip has been damaged, the car will not recognize the key. In this case, visit your local dealership to have them test your key to determine if a damaged PATS microchip is the cause of your no-start problem.
