Before you changed the ballast you should have checked the bulb contacts for
corrosion. I had a fixture driving me nuts and finally decided to abraid
the contacts by removing and replacing the bulbs about 20 times. That was 2
years ago and the fixture has been working great since.

By the way a tip for anyone with flourscent fixtures in the garage. This
has been posted before but a long time ago. If your area suffers from cold
weather and bulbs don't work well in winter, by those cheap flourscent tube
protectors. They help the bulbs warm up much faster and the bulbs will be
bright even in a cold winter.


"Yong Huang" wrote in message
...
One pair of the fluorescent lamps in the kitchen stopped working. I
replaced with the other pair in the same big box on the ceiling. They
still didn't work. Then I bought a ballast from Home Depot, a magnetic
type, and installed it. One of the two bulbs can flash with dim light.
I did this before (in a different place). Replacing ballast and all
was well. But this time I'm at a loss.

Can somebody tell me how I check the ballast or circuit? I did all the
following measurements. Both ballasts are like this:

_________
Blk | | Blu
W | | Blu
Y | | R
Y |_________| R

Old ballast:
Blk to W: 12ohm; Y to Y: 2 ohm
Blu to Blu or R to R: 2 ohm; no continuity between Blu and R
Blk to Blu: 3ohm; W to Blu: 10ohm

New ballast:
Blk to W: 8ohm; Y to Y: no continuity
Blu to Blu or R to R or : no continuity
Blk to one Blu: 1.5ohm; Blk to the other Blu: no continuity
W to the first Blu: 8ohm; W to the other Blu: no continuity

After I turned power on, I checked the voltage on the wires when the
new ballast is installed:
Blk: 120v; Y and W: 0
Blu: 120v; one R: 0; the other R: 140v

Of all the 4 sockets (for 2 bulbs), one which 2 blue wires go in has
120V. The other 3 are 0.

I don't know what I should measure exactly. Thanks for help.

Yong Huang