Wiring a sub panel with 2-2-2-4 wire. All wires but ground

I am wiring up a sub panel in a detached garage. I ran 2-2-2-4 wire . The only wire that is different is the 4 gage wire which has a yellow strip. I need to label each of the three wire red, black and white. I tried to apply a charge to one of the wires using ground as a neutral and one ode the wires as hot on the garage end. Then go into the house and test the wires with a light tester. I put the black on the ground as I did in the garage and the red on one of the wires. The light came on. I thought I found my wire. Then just to be sure, I touched the red to the next wire. It lit up also; and so did the next one. This is impossible since two of the wires never had the charge applied to them.

Any suggestions?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References able2know.org/topic/429985-1

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