+1 I would be checking grounds for sure.
If the battery cables are original they should probably be replaced. They can corrode inside where you can't see and cause problems.
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2008 Mercury Sable Premier
2014 Ford Focus Electric
1997 Mercury Grand Marquis GS
1991 BMW 850i E31 M70 V12
Moved On: 2000 Sable LS Premium Duratec