How to Build and Use a Test Cord for Appliance Testing

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简介

A cheater cord (also called a test cord, tester cord, or component tester) lets you power and test an appliance part away from the appliance, such as a washer drain pump or a refrigerator heater element. This guide shows how to add spade terminals to a lamp cord with an on/off switch, how to connect it to common components, and how to use a kilowatt meter to measure power draw.

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步骤 1 Prepare a safe testing area

Work on a dry, non-conductive surface with the appliance part secured so it can’t roll, spin, or move when powered.
WARNING: This procedure uses live mains voltage, which can cause shock, burns, or death.
Unplug the test cord any time you’re attaching wires or changing configurations.
Keep fingers, tools, jewelry, and loose clothing away from exposed terminals and moving parts.
Use a GFCI-protected outlet if possible, and don’t test parts near water.

步骤 2 Gather materials and tools

Get a basic two-prong lamp cord with an inline on/off switch.
Get 14 AWG female spade terminals that match the tabs on the parts you plan to test.
Get a kilowatt meter if you want to measure watts, volts, and amps while testing.
Use a quality crimping tool, since low-quality crimp connectors can fail and waste time and money.
Use a wire stripper or cutter as needed for your cord and terminals.

步骤 3 Prepare the cord wires

Open the cord end you’ll be adding connectors to, so the two conductors are accessible.
Strip enough insulation from each conductor to fit fully into the spade terminal barrel you’re using.
Twist the exposed wire strands on each conductor so they’re tight and secure.
Caution: Don’t leave stray strands outside the terminal, since they can short to the other wire or to metal parts.

步骤 4 Crimp the female spade terminals

Slide a 14 AWG female spade terminal onto a prepared wire end until the copper is fully inside the barrel.
Use the blue crimp position on the crimping tool for these 14 AWG terminals.
Crimp the terminal firmly, then pull on the wire to confirm it won’t slip out.
Repeat the strip, twist, and crimp process for the second conductor.
Note: A test cord is a good place to practice crimping, since a bad crimp can cause poor contact and unsafe heating.

步骤 5 Set up the kilowatt meter and switch

Plug the kilowatt meter into the wall outlet.
Plug the cheater cord into the kilowatt meter, and set the cord’s switch to Off.
Use the meter to view watts and other readings while the part is running.
Caution: Treat the spade terminals as live whenever the cord is plugged in, even if the switch is Off.

步骤 6 Test a washer drain pump

Attach the two female spade terminals to the drain pump’s two terminals.
Identify which pump wire is live and which is neutral before powering the pump.
Note: In this configuration, the live is on the blue wire and the neutral is on the brown wire.
Turn the cord’s switch On to run the pump and read the wattage on the kilowatt meter.
If you suspect polarity affects the pump’s rotation, shut the switch Off, unplug the cord, swap the connections, and test again.
Caution: Don’t intentionally jam or obstruct a running pump with tools, since you can damage the part and seriously injure yourself.

步骤 7 Test a heater element with piggyback connectors

Connect the cheater cord’s spade terminals to the heater wiring using the existing piggyback connectors so the terminals can be swapped quickly.
Turn the cord’s switch On and watch the kilowatt meter to see the heater’s power draw.
Carefully feel for heat at a safe distance and verify the element is warming.
Caution: Heater elements get hot enough to burn skin and ignite nearby materials, so keep the element away from plastic, paper, and wiring insulation.
Note: In this test, the meter showed about 13.4 to 13.5 watts, and the heater produced a noticeable temperature increase.

步骤 8 Shut down and plan connector options

Switch the cord Off and confirm the meter drops to zero watts before handling any connections.
Unplug the cord from the meter, then unplug the meter from the wall outlet.
Inspect each crimp for a tight fit, since poor-quality crimp terminals can fail and cause unreliable tests.
Build multiple cords if you want different end connectors, such as versions with male connectors for plug-in style connections.
Reminder: Store the cheater cord with the switch set to Off so it’s less likely to be energized accidentally during setup.

结论

Use the cheater cord and kilowatt meter to verify that a component runs, heats, or draws power in a way that matches expectations. Keep tests short, keep terminals covered and away from contact, and unplug the cord before touching or swapping any spade connections.