Things You'll Need:
- Black wire
- Red wire
- Green wire
- Wire strippers
- LED
- Power supply
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Step 1
Cut 3 24 inch wires for your power supply tester. It's easiest to make these different colors so you can easily tell them apart. Specific colors are usually used to represent long and short leads.
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Step 2
Strip the wires at each end with a pair of wire strippers or pliers.
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Step 3
Connect a black wire to the short lead of the light emitting diode, or LED, to make your power supply tester. You can solder these in place, or just wrap the wire around the metal.
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Step 4
Secure a red wire to the long lead of the LED.
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Step 5
Cut the black wire connected to the short lead in half and strip it at both ends.
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Step 6
Attach a green wire to the end of the black wire is connected to the short lead.
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Step 7
Connect the black half-piece of wire to the end of the short lead wire as well.
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Step 1
Turn the power supply off. There is usually a button on the side to do this.
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Step 2
Find the pin with a green wire leading from it on your power supply. Connect the green wire from your tester to that pin.
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Step 3
Locate the pin attached to a black wire and connect it to the black tester wire.
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Step 4
Connect the red wire from your power supply tester to the red, orange or yellow wired pin.
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Step 5
Turn on the power supply.
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Step 6
Look at the LED on your power supply tester to see if it lights up. If it does, your power supply is working.
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Step 7
Test your power supply further by moving the red wire to a different pin with a red, yellow or orange wire.
