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Purchase A Ballast That Matches The Voltage Of The Existing Ballast And Has The Same Wiring Diagram. Mount The New Ballast And Screw The Nuts Into Place. Strip All Of The Wires To Expose About 1/2-inch Of Wire And Use Twist-wire Connectors To Connect The Same-colored Wires. Replace The Ballast Cover And Bulbs, And Turn The Power Back On.