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Old 08-19-2015, 09:00 AM   #1
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Converting old ballast?


I've searched around the forum and couldn't seem to find an answer to this. I basically need to replace a ballast in an 8ft florescent fixture. My old ballast only has 3 wires coming out. The part that seems to have me confused is there only seems to be one line wire on my current setup that needs to be replaced. I have two wires coming out of the ceiling for power and I have three wires inside the light fixture....two from one light connector and one from the other. The single wire on one end is connected to the blue wire of the old ballast. One of the wires from the other end is hooked to the white ballast wire and the second is hooked up to the white wire from the ceiling. There is a red wire coming out of the ceiling which connects to the black wire on the ballast. I will attach a picture of the wiring diagrams of both ballasts to paint a clearer picture. I cannot find an identical ballast to the one I have but the guy at the hardware store said the one they sold me would work. Perhaps I'm overthinking it an confusing myself?
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Old 08-19-2015, 09:42 AM   #2
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You are over thinking it. You are replacing an old magnetic ballast with an electronic. Connect as shown but leave the second blue wire for the second lamp unconnected.(tape the end).

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Old 08-19-2015, 11:19 AM   #3
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How many lamps do you have in the fixture?
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Old 08-19-2015, 11:27 AM   #4
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Awesome! Thanks a bunch its working good now
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Old 08-19-2015, 11:30 AM   #5
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It was a single lamp fixture... The part confusing me was the wires coming from the connectors where the light goes in ...one side had one wire and the other had two. But I spliced the two on the one side together and hooked it to one of the blue wires on the ballast and the red ballast wire to the other connector. It seems to be working good now
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Old 08-19-2015, 12:00 PM   #6
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The 2 wires on one of the lamp socket was only a splice point.
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Old 08-19-2015, 12:57 PM   #7
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I think one of the sockets is a circuit interpreting tombstone for when the lamp is removed.

In any case both pins must be shunted for an instant start ballast.
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Old 08-19-2015, 02:29 PM   #8
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Quote:
Originally Posted by Jump-start View Post
I think one of the sockets is a circuit interpreting tombstone for when the lamp is removed.

In any case both pins must be shunted for an instant start ballast.
He has single pins lamps, not bi-pin.
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Old 08-19-2015, 03:15 PM   #9
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Quote:
Originally Posted by rjniles View Post
He has single pins lamps, not bi-pin.

Oh, good point. 8 foot is a giveaway. Didnt see that, my bad then.

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