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Replacing a ballast of the same type (2 lamp with 2 lamp, instant start with same) is fairly simple. The wiring connections and colors match up.
Factory wiring
Replace 1 Lamp Rapid Start with 2 Lamp Instant Start
Replace 1 Lamp Rapid Start with 2 Lamp Rapid Start
Replace 2 Lamp Instant Start
Replace 2 Lamp Rapid Start with Instant Start
Replace Alternate 2 Lamp Rapid Start with Instant Start
Replace 3 Lamp Two Instant Start with One Instant Start
Replace 3 Lamp Rapid Start with Instant Start
Replace 3 Lamp Two Rapid Start with One Instant Start
Replace 3 Lamp Programmed Start with Instant Start
Replace 3 Lamp Programmed Start with Rapid Start