Corrosion can form at the grounding points near the battery. There may be electrical faults and the engine may crank but not start.
Car Problem Reports
Lincoln Town Car Corrosion May Form at Grounding Points Near Battery
Lincoln Town Car Problem
Average Mileage: 63,000 mi (31,000 mi - 95,000 mi)
Visitor, 2003 Lincoln Town Car, 31,000 mi
has not ben fixed yet
BASICALLY, MY CAR WILL START WHEN IT WANTS TO. IT DOSENT REALLY RUN ROUGH OR ANYTHING, SOMETIMES, IT JUST WONT START. AND SOMETIMES IT WILL. HOW MUCH WILL SOMETHING LIKE THIS COST ME TO FIX, ACCORDING TO WHAT I HAVE READ IT IS THE GROUND WIRES