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battery light/check charging


New member
2006 Navigator. Installed a new alternator as needed. Now the battery light stays on and check charging comes on. Tested the battery and its at 12.4 volts engine off. volts engine running=13.9/14.0 volts. So my first question is how to clear these messages so I can start fresh. question #2 is what scan tool should I purchase for this vehicle? Thanks for your time