SewGlo™ · Power Connection
SewGlo™
Connection Guide
Step-by-step instructions for connecting SewGlo™ Illuminated Thread to a power lead. Covers lead preparation, conductor separation, soldering, insulation, and inverter connection. Applies to all three variants.
Watch First
Step-by-Step Video
Watch the full connection walkthrough before starting. It covers every step from stripping the outer sheath through final inverter connection and test.
Before you start: Leave 10 to 20cm of thread tail at each end when sewing or embroidering. This is the working length you need to strip, separate the conductors, and make the connection. A tail that was trimmed flush to the fabric cannot be connected. Automatic thread cutting must be disabled on your sewing or embroidery machine.
What You Need
Materials Required
SewGlo™ Thread
LT, HD, or XR
EL Inverter
800 to 6,500 Hz rated
Isopropyl Alcohol
90% or higher concentration
Soldering Iron & Solder
Fine-tip preferred
Heat Shrink Tubing
Small diameter for compact joints
Pigtail Lead / Connector
EL Wire connector kit
Conductive Adhesive
Optional, for fibrous conductor
Electrical Tape
Optional secondary insulation
Waterproof Adhesive
For sealing cut ends before washing
EL Wire connector kits are available at checkout. Custom connection and splicing services are also available if you prefer a factory-made connection. Contact info@ellumiglow.com for production-volume connection requests.
Know Your Thread
SewGlo™ Conductor Anatomy
SewGlo™ thread contains two internal conductors inside the outer sheath. Understanding what each conductor is before you start makes the connection process straightforward.
Outer Sheath
The transparent or translucent outer coating. This is what gives the thread its smooth texture and color. Removed with isopropyl alcohol to expose the conductors beneath.
Phosphor-Coated Core
The main conductor. This is the larger element inside the thread. The copper wire core is coated with the EL phosphor compound that produces the glow. Solder this conductor to the main power lead.
Fine Fibrous Conductor
Newer SewGlo™ versions use a fibrous structure for the ground conductor. This is wound around the outside of the phosphor core inside the sheath. Attach to the return lead using conductive adhesive or solder.
On the newer fibrous conductor: Older SewGlo™ thread used angel hair wire strands for the ground conductor. Newer versions use a fibrous material. The connection method is the same for both: separate it from the core and attach it to the return lead. Do not cut the fibrous conductor shorter than needed.
Wiring
Step-by-Step Connection Instructions
01
Strip the outer sheath
Soak 25 to 50mm (about 1 to 2 inches) of the thread tail in 90%+ isopropyl alcohol for 30 to 60 seconds. The alcohol softens and loosens the outer phosphor coating. After soaking, gently massage the sheath off toward the cut tip. This exposes the two internal conductors without heat, which could damage the phosphor layer. Do not use a wire stripper or blade on SewGlo™ thread as this will cut through the fine conductors.
02
Separate the conductors
With the sheath removed, gently twist the thread tail counterclockwise to separate the two internal conductors. The larger phosphor-coated copper core will become visible in the center. The fine fibrous or wire-strand ground conductor will separate to the outside. Keep them apart and do not allow them to touch during the connection process or a short will occur before you can insulate.
03
Prepare your connector or pigtail lead
Before soldering, slide a piece of heat shrink tubing over the SewGlo™ thread tail so it is ready to slide over the finished joint. Heat shrink cannot be added after soldering. The tubing should be large enough to cover the full connection area but small enough to grip the wire securely when shrunk. If using a connector kit, position the connector near the separated conductors before soldering.
04
Solder the phosphor-coated core
Solder the larger phosphor-coated conductor to the main power lead or the center pin of your connector. Keep the soldering iron contact brief. The phosphor core is delicate and prolonged heat exposure can damage the light-emitting compound at the connection point. A quick, clean solder joint is the goal. If the thread fails to illuminate near the joint after testing, overheating the core during soldering is the most common cause.
05
Attach the fibrous conductor
Attach the fine fibrous or wire-strand ground conductor to the return lead or the outer contact on your connector. Use conductive adhesive or a light solder joint. If using solder, be especially brief with heat contact on this conductor as it is fine and can be destroyed by too much heat. Twist or bundle the fibrous strands together before attaching for a cleaner connection.
06
Insulate the connection
Slide the pre-positioned heat shrink tubing over the completed connection. Apply heat with a heat gun until the tubing contracts firmly around the joint. For added protection, wrap electrical tape over the heat shrink. Do not allow any exposed conductor to remain at the connection point. Exposed conductor can short against metal fasteners, adjacent threads, zippers, or other conductive materials inside a garment or installation.
07
Seal the opposite end
The far end of the thread run does not need a power connection, but it does need to be sealed. Apply waterproof adhesive to the cut end to prevent moisture intrusion. If the thread will be washed, sealing both the connection end and the cut end before the first wash cycle is required. Moisture that enters through an unsealed cut end can degrade the conductors and shorten the thread's service life.
Power
Connecting to the Inverter
Once the thread connection is complete, connecting to the inverter is straightforward. The inverter converts DC battery or wall power to the AC frequency the thread requires to illuminate.
Plug in via JST connector
Plug the completed SewGlo™ pigtail lead into your EL inverter via the JST connector. Most Ellumiglow inverters use a standard JST connection. The connector is keyed so it can only be inserted in the correct orientation. If it does not seat easily, do not force it.
Inverter sizing for SewGlo™
SewGlo™ draws approximately 25% of the power of standard EL Wire per foot. An inverter rated for 15 to 30 feet of EL Wire will support 60 to 120 feet of SewGlo™. Calculate total thread length across all strands before selecting the inverter. Optimal drive frequency is 800 to 6,500 Hz.
Battery vs. wall power
For wearable applications, battery-powered inverters (AA, D cell, or USB-rechargeable packs) make the build cordless. For fixed installations, a wall-outlet AC adapter provides consistent power. The LumoS and LumoX packs are the most popular wearable inverter options for SewGlo™ builds.
Test before finishing
Power on the inverter immediately after completing the connection, before finishing the garment or installation. Confirm the thread illuminates from the connection point to the far end. If only part of the thread lights, there is a short between the connection and the dark section. Locate and re-solder that joint before proceeding.
Multiple strands: Use a splitter to connect multiple SewGlo™ segments to a single inverter. Each strand gets its own pigtail lead connection, all running to the splitter, which connects to the inverter via a single JST lead. Count total thread length across all connected segments when sizing the inverter.
Diagnostic
Troubleshooting
Most SewGlo™ connection problems fall into three categories. Each has a specific cause and fix.
No light at all
- Inverter is not powered on or battery is dead
- Pigtail connector is not fully seated in the inverter
- Both conductors are shorted together at the connection point
- A needle pierced the fiber during sewing, creating a short between the connection and the needle hole
- Soldered connection to the core conductor is broken
Thread lights only partway
- A short exists somewhere along the thread run. The thread illuminates from the connection up to the short point, then stops.
- Most commonly caused by a needle piercing the fiber during sewing or embroidery
- Locate the dark section's start point. The short is at or just past that point.
- If the needle cannot be found, the connection will need to be re-routed from the near side of the dark section
Flickering
- Loose connection at the pigtail lead junction with the inverter
- Fibrous ground conductor is making intermittent contact at the attachment point
- Solder joint on either conductor is cold or cracked
- Battery level is low on battery-powered inverters
- Connection point is in a high-flex area of the garment and is being stressed during movement
Dim output
- Inverter is undersized for the total thread length connected to it
- Inverter frequency is below the 800 Hz optimal range for SewGlo™
- Battery is running low
- Thread run exceeds 10m (LT) or 20m (HD) without parallel connections; luminance drops off toward the far end on longer runs
- Prolonged heat exposure during soldering damaged the phosphor layer near the connection
Still not working? Contact Ellumiglow for technical support. Include the variant (LT, HD, or XR), thread length, inverter model, and a description of what the thread does when powered on. Email info@ellumiglow.com or call 877.615.6556.
SewGlo™ Guides
Machine Settings · SewGlo™ LT
SewGlo™ Embroidery Guide
Machine settings, stitch spacing, and tension for embroidery applications.
Machine Settings · SewGlo™ HD
SewGlo™ Sewing Guide
Sewing machine setup, hand stitching, and fabric compatibility.
Technical Reference
Technical Specification
Full specifications for all three SewGlo™ variants.
Overview
SewGlo™ Info Sheet
Variant comparison, wiring diagrams, and FAQ.
- Choosing a selection results in a full page refresh.
