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noquacks 01-15-2013 12:21 PM

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?
Thanks

joecaption 01-15-2013 12:25 PM

Checked for incoming power?

noquacks 01-15-2013 02:08 PM

Quote:

Originally Posted by joecaption (Post 1094047)
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.

joed 01-15-2013 03:41 PM

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.

noquacks 01-15-2013 04:00 PM

Quote:

Originally Posted by joed (Post 1094179)
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......

noquacks 01-15-2013 05:59 PM

In other words, if I take voltage of those wires going to ballast, what should I expect?

jbfan 01-15-2013 06:42 PM

Bad ballast.

noquacks 01-15-2013 06:44 PM

Quote:

Originally Posted by jbfan (Post 1094335)
Bad ballast.

guess it could happen, (mentioned in my 1st post I replaced with new). Have you ever seen a "new" ballast be bad?

jbfan 01-15-2013 07:13 PM

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?

kbsparky 01-15-2013 08:11 PM

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

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. :no:

mpoulton 01-15-2013 08:24 PM

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.

Missouri Bound 01-15-2013 08:28 PM

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?:wink:

joed 01-15-2013 08:39 PM

Quote:

Originally Posted by noquacks (Post 1094191)
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.

frenchelectrican 01-16-2013 12:26 AM

Quote:

Originally Posted by noquacks (Post 1094045)
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

noquacks 01-16-2013 07:44 AM

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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