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sprinkles08, ASE Certified Technician
Category: Cadillac
Satisfied Customers: 22805
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Cadillac Deville: Getting messages battery volts high new

Customer Question

Getting messages battery volts high new battery new alternator still message it's effecting the ride and at nite my headlights flicker
Submitted: 2 years ago.
Category: Cadillac
Expert:  sprinkles08 replied 2 years ago.
Hello and welcome to Justanswer!
If it's overcharging yet replacing the alternator didn't change anything then I would suspect the alternator is seeing an incorrectly low reference voltage. The regulator in the alternator reads a reference voltage to determine charging strategy. If it's seeing an abnormally low voltage due to a poor connection or wiring issue on this circuit then it will cause overcharging.
If the alternator case is poorly grounded or the engine ground is poor this will also cause overcharging. If the engine ground itself was poor you should also have starting issues though.

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