How to Make a Test Power Cord for a Used Dryer Motor (Whirlpool and GE)

Whether you’re a service technician trying to bench-test a used dryer motor before installing it, or a hobbyist who wants to repurpose an old dryer motor as the power source for a benchtop tool, you need a way to plug that motor into 120V wall power. The motor came out of a dryer with a six-wire harness, not a plug. This guide walks you through making a clean, safe test cord for the two motor styles you’ll run into in most American dryers — the Whirlpool style (also used in Kenmore, Estate, and some Samsung machines) and the GE style.

I’m Chip Knowles. I run Harper & Knowles Washing Machine and Dryer Repair in Oakdale, Louisiana. Watch the full build in the video below, then read on for the details, including which of the six wires you keep and which you cut.

Watch the full build

⚠️ Safety first

You’re working with 120V AC line voltage. Two rules that aren’t negotiable:

Never plug the cord in until you’re completely done wiring and all your splices are insulated. No exposed copper, anywhere.
Always include the ground wire (the green one). A dryer motor frame can become energized if a winding shorts to it. The ground is what trips the breaker instead of you taking the hit.

If any of this feels uncertain, this is the kind of job a service tech or experienced electrician should handle. The motor isn’t worth a trip to the hospital.

What you need

Every tool and part below is on my Amazon storefront — easiest one-stop spot to grab the whole kit: amazon.com/shop/harperknowleswasheranddryerrepair

To build the cord you’ll need:

A pigtail from an old dryer wiring harness — the connector that plugs into the motor. Three sources in order of preference: (1) pull it from the same scrapped dryer the motor came from — perfect fit and free; (2) check local appliance repair shops — most have buckets of old harnesses; (3) last resort, OEM replacement motor harnesses on my Amazon storefront: amazon.com/shop/harperknowleswasheranddryerrepair. The exact pigtail matters — the connector has to mate with the motor’s interface.
A standard 120V three-prong power cord with hot, neutral, and ground (you can cut the female end off a cheap extension cord) — Buy on Amazon
A crimping tool — Buy on Amazon
Inline butt splicers — I prefer these over wire nuts for this build — Buy on Amazon
Heat shrink tubing sized for the wires — Buy on Amazon
A heat gun — Buy on Amazon

Tip from experience: put the heat shrink tubing on the wires before you crimp the splices. If you forget, you’ll have to cut the splices off and redo them. Ask me how I know.

The two motor styles

Most American dryers run one of two motor types. A service tech can cover the vast majority of jobs with just these two interface pigtails:

Whirlpool style — found in Whirlpool, Kenmore, Estate, and some Samsung dryers. The only real differences between models are shaft length and how the motor mounts in the cabinet. The electrical interface is the same.

GE style — different connector layout, different wire colors, same idea.

Today we’re building a test cord for each.

Wiring the Whirlpool-style motor

The pigtail has six wires but you only need three. Here’s what each wire does on the Whirlpool-style motor:

Blue — runs to the heat switch, then into the run windings
Purple — directly into the start windings (a centrifugal switch on a weighted flywheel inside the motor disconnects this once the motor spins up to speed)
Orange and white — into the windings on the other side

For our purposes — just spinning the motor — we don’t need the heat-element wire. We keep the ground, we keep the neutral, we keep the hot. Everything else gets cut.

So the three wires we splice to our power cord are:

Hot (black from the cord) → the wire that energizes the run circuit
Neutral (white from the cord) → the motor’s neutral return
Ground (green from the cord) → the ground/chassis wire

Use three inline butt splices, one per wire. Crimp each splice down hard. Slide the heat shrink over the splice and hit it with the heat gun until it’s tight and clear. Plug it in. The motor should spin right up.

Wiring the GE-style motor

The GE motor’s a little different but the principle’s the same:

Blue wire — ground
Hot — the middle wire
Neutral — the wire on the right

The three wires you don’t need go to the timer and the heating element. Cut them off. Better yet, pull those spade connectors out of the plug body with a pick or punch so they can’t accidentally touch anything once power’s on. Some of those wires can become energized when the motor spins up, so getting them out of the connector entirely is the cleaner play.

Cut the three wires you’re keeping all to the same length. Strip them back. Twist them together neatly. Crimp three connectors onto the matching wires from your power cord. Remember to put the heat shrink on first this time. Slide the splices together, shrink-wrap them, and plug it in to test.

Testing

With everything wired and insulated, plug the cord into a 120V outlet. The motor should spin up to its normal operating RPM within a second or two. If it hums but doesn’t spin, you’ve got the start winding wired wrong. If nothing happens at all, check your splices — usually one of them isn’t making full contact.

What about washing machine motors?

Washing machine motors are wired differently. They need a capacitor to start, and most of them are reversible. You can’t just throw a three-wire test cord on them and expect them to run.

I built a benchtop test box for washing machine motors that has a forward/reverse switch and the capacitor wired in. I’ll cover that build in a future video — subscribe to the Harper & Knowles YouTube channel so you don’t miss it.

Need a pigtail?

Three ways to get the right pigtail, in order of preference:

Pull it from the same scrapped dryer the motor came from. Perfect fit, free, and you already have it in front of you.
Check appliance repair shops in your area. Most have buckets of old harnesses and will sell or give you one for a few bucks.
As a last resort, Amazon. OEM replacement motor harnesses run pricier than salvaged ($30–60). See my storefront: amazon.com/shop/harperknowleswasheranddryerrepair

Rather have a pro do it?

If you’re in central Louisiana — Oakdale, Oberlin, Glenmora, Elizabeth, Pitkin, Pine Prairie — and your washer or dryer is acting up, give Harper & Knowles a call at (337) 831-6757. We’ll diagnose the actual problem, source the right part, and get your machine running again.

About the author: Vernon “Chip” Knowles is the owner of Harper & Knowles Washing Machine and Dryer Repair LLC in Oakdale, Louisiana. He’s been repairing washers and dryers since 2019 and publishes a new repair video every Sunday on the Harper & Knowles YouTube channel.