Problems with wiring a basement

I am finishing my basement. The existing wiring in the basement has two 20amp circuits currently being used to run 6 basic pull chain lites.

I have taken the wire from one of these lite ciruits and in a room that I have framed, run the line coming from the circuit panel to the first electrical outlet in the room, it then goes to 5 other outlets, then to a lite switch, and the lite switch to the overhead lite fixture. This is where the wire ends, at the overhead lite fixture.

I was careful to run the wire with the hot wire(black) on the hot side of the electrical outlets, and the nuetral(white) on the neutral side. After completing the wiring task, I flipped the circuit breaker back on, and the ceiling lite lited. I took a electrical tester to test each outlet. The tester is a small plug in type with three lites, two yellow and a red. If two yellow lites lite on the tester when you plug it into a wired outlet, it is a properly wired connection. Each one of the outlets showed two yellow lites on the tester. The ceiling fixture along with a pull chain lite, has an electrical receptical and when that was tested, it showed reverse polarity. I switched the hot/neutral wires and it tested fine.

Now the problem that I have is when the lite switch is used to operate the overhead lite, and is moved to the off position, it blows the circuit breaker immediately.

Sorry for the short novel, but can anyone help me????

 

You failed to mention how the wire is ran to the pull chain fixture.
How is the switch wired?whites wire nutted together and blacks on switch?

 

I am sorry, the wiring runs from the fuse panel, goes to 5 electrical wall outlets in succession, then to the wall mount lite switch, then to the ceiling lite fixture(pull chain). On the lite swittch, black is to black, and white is to white.

 

You have the switch creating a dead short.
At the switch connect the 2 blacks to the switch and connect the whites to each other with a wire nut.

 

I just got done rewiring the lite switch and everything test fine and works fine. Thank you