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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 34442
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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what does it mean when the battery gauge is near the high ...

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what does it mean when the battery gauge is near the high voltage red line? When we drive our car the bat gauge is in the normal 11-15 volts range but after a little while of driving its slowly creaps up toward the 18 volts end which is in the red area.

HelloCustomer

What this means is, its likely your alternator which has a built in voltage regulator and it is over charging your battery. You should have the alternator tested and most likely it will need replacement.

Ron and other Ford Specialists are ready to help you
The normal charging rate is 14.2 volts. This could ruin your battery if you let it go to long.