1983 Ford F350 gauge

Gauge on dash board for charging reads minus pegs the left when light’s get6 turned on

Have the alternator and battery tested. I suspect your alternator is failing.

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Pretty generic answer it’s new. And charging I’m thinking voltage regulator. Or any other suggestions ???

Was gauge working before you changed alternator?

Often, a “generic answer” is a good starting point in solving a problem, and can rule out simple issues, before moving on to more complex troubleshooting. Have you had the battery tested?

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