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Can I replace a 4 wire ballast with a 5 wire one?

The new ballast has an extra blue wire.

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    Instead, get rid of the ballast and replace the old fluorescent lamp with a more efficient, longer lasting LED lamp. – DrMoishe Pippik Jun 6 at 22:17
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    Probably not. Shoot us a picture of the wiring diagram on the old ballast, and we can advise. – Harper Jun 6 at 22:19
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    Yes, can you post photos of the wiring diagrams on the old and new ballasts? – ThreePhaseEel Jun 6 at 22:44
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My understanding is that yes, you can. The 5 wire is simply a newer, safer design for a ballast. However, should you? Unless you are working on one ballast in a large system, it may be wiser to upgrade to LED technology and solder/cone new fixtures into your workspace, then you'll never have to deal with those darn ballasts again!

Useful Diagram: http://www.electrical101.com/ballast-diagrams.html

Tutorial: https://www.youtube.com/watch?v=CeRkLdrMwqQ (Unsure as to how accurate this may be, there are other online resources as well)

Disclaimer I am not an electrician nor do I pretend to be one. I do a fair amount of DIY projects and home improvement but am not a professional!

  • Hello, and welcome to Home Improvement. Thanks for the answer; keep 'em coming! – Daniel Griscom Jun 6 at 22:45

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