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Old 01-15-2013, 12:21 PM   #1
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8 foot fluorescent lamp trouble


have a 2 bulb, 8' fluo fixture, replaced ballast, but on 2 new bulbs (tubes), and no light. So, took Ohms readings of both terminals (one blue/red wires, other blk/white), and one terminal 160+- ohms, other 80 or so. Are these good readings? What is ideal? Am I on the right track?
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Old 01-15-2013, 12:25 PM   #2
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8 foot fluorescent lamp trouble


Checked for incoming power?

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Old 01-15-2013, 02:08 PM   #3
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Checked for incoming power?
Good point, joe, but yeah, it is in a SERIES - theres a working unit before AND after it. Thats what is getting me. Other culprit could be the main feed wire could be grounding on the metal case/box.....but doubt it.
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Old 01-15-2013, 03:41 PM   #4
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Still could be a power problem. The wires on the ballast are smaller than the line wires and sometimes they don't connect even if the power wires do.
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Old 01-15-2013, 04:00 PM   #5
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Still could be a power problem. The wires on the ballast are smaller than the line wires and sometimes they don't connect even if the power wires do.
OK, Joe, then what should I do? Check for voltage at the blk/wh low v wires? Or the red/blue wires? What should one get for V reading? What V should one see there? I already did ohms......
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Old 01-15-2013, 05:59 PM   #6
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8 foot fluorescent lamp trouble


In other words, if I take voltage of those wires going to ballast, what should I expect?
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Old 01-15-2013, 06:42 PM   #7
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8 foot fluorescent lamp trouble


Bad ballast.
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Old 01-15-2013, 06:44 PM   #8
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Bad ballast.
guess it could happen, (mentioned in my 1st post I replaced with new). Have you ever seen a "new" ballast be bad?
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Old 01-15-2013, 07:13 PM   #9
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Many times.
Is the ballast warm to the touch?
We had this discussion in another thread.
Did you wire the new ballast like the old, of by the diagram?
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Old 01-15-2013, 08:11 PM   #10
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8 foot fluorescent lamp trouble


Problem is, many times the new ballast needs to have the entire fixture rewired, or "creatively wired" for it to work properly.

One simply just can't replace the ballast and reconnect the wires as before, since many of the older ballasts are series wired, and the new ones are not.
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Old 01-15-2013, 08:24 PM   #11
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8 foot fluorescent lamp trouble


Check voltage at the black and white (incoming power) wires on the ballast. Use a non-contact tester to check for voltage at the lamp sockets (voltage may be close to 1000V, so don't use a meter unless it's rated for that!). Test the lamps in the other fixtures next to it. Swap ballasts with another fixture. Do any other tests you can think of to isolate the problem.
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Old 01-15-2013, 08:28 PM   #12
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8 foot fluorescent lamp trouble


Wired wrong, wrong ballast, wrong voltage, no voltage, wrong lamps.....bad ballast...that's a few things that could be wrong. Is this a magnetic to electronic replacement?
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Old 01-15-2013, 08:39 PM   #13
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Originally Posted by noquacks View Post
OK, Joe, then what should I do? Check for voltage at the blk/wh low v wires? Or the red/blue wires? What should one get for V reading? What V should one see there? I already did ohms......
Tug on the power wire connections and see if they pull out. Undo the power wire connections and redo them.
Could also be a bad ballast.
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Old 01-16-2013, 12:26 AM   #14
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8 foot fluorescent lamp trouble


Quote:
Originally Posted by noquacks View Post
have a 2 bulb, 8' fluo fixture, replaced ballast, but on 2 new bulbs (tubes), and no light. So, took Ohms readings of both terminals (one blue/red wires, other blk/white), and one terminal 160+- ohms, other 80 or so. Are these good readings? What is ideal? Am I on the right track?
Thanks
Is this a slimline ( single end pins useally either 60 or 75 watters ) or High Output ( recssed double pin useally 95 or 110 watts ) ??

That will make the differnce and if you have the ballast number if you can read it please posted to us we can indentify quick.

Did you check the incomming source to make sure you have power ?

With the slimline ( single pin verison ) look at the fixed end carefully to see if damaged concats or not.

Merci,
Marc
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Old 01-16-2013, 07:44 AM   #15
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8 foot fluorescent lamp trouble


wow, so much help!! Thanks, guys! Im on my way to work, where I will post the specs on the ballast. Meanwhile, I will try switching it to another lamp that works......

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