Electricity is like water.
If you connected your house to the water main, added lines and faucets, then when you turned on the faucet there was no water, what would you do?
As Pete said, start at the beginning and make sure you have water coming in from the main source, your generator in this case.
If yes, follow along the path at each connection and make sure you still get a reading (~120v).
When you stop getting a reading, that's likely where your problem is.
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Steve
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