Electrical 101  

Switches | Outlets | Troubleshooting | LED Tube Lights | Basic Electricity  | Ballasts | Replace Ballasts | Misc Articles

About      Privacy Policy      Question?     Copyright © 2026 Electrical101.com      Terms of Use

How to Replace 1 Lamp Rapid Start Ballast with 2 lamp Instant Start

A 1 lamp rapid start (series) ballast can be hard to find, but it can be replaced with a 2 lamp instant start (parallel) ballast. Here is how a 2 lamp ballast is wired to a 1 lamp fixture. Find 2 Lamp Instant Start Ballasts

Rapid Start Ballast Diagrams

Factory wiring

2 Lamp Instant Start Ballast Diagram

2 Individual wires, 1 common wire

1 Lamp Rapid Start Ballast Replaced with 2 Lamp Instant Start Ballast Diagram

Replace

Ballasts

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 2 Lamp Rapid Start

Replace 3 Lamp 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

Replace 4 Lamp Instant Start

Replace 4 Lamp Two Rapid Start with One Instant Start

Replace 4 Lamp Rapid Start with Instant Start