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Hello, Can you confirm the make and model of the ballast?
If you look at the wiring diagram on the ballast, it will show both bulbs. Basically you wire one bulb as per the diagram and "cap" the other two wires with wirenuts individually. Do NOT tie those wires together! That should do it!
Using one bulb, you will need only 1 yellow On one end of the bulb, and one blue on the other end!
Cap the other Yellow
Cap one Blue
Cap both reds individually
One moment, while I double check the model please
How many wires are coming out from each end of the fixture, going to each end of the bulb?
thanks for that information, one moment please.
Thanks for waiting. Please try the following:
1. Connect each red from the ballast to the red wires of the fixture.
2. Connect one yellow to the blue, and the other yellow to the white of the fixture (bulbsockets)
3. Cap the blue wires individually ( you should not need them).
4. The black and white wire to the ballast should connect to the black and white power wires coming in
Please try that and let me know if it works properly.