Categories:

18 Gauge

18 Gauge Primary Wire, 25 ft Spool
$7.00
18 Gauge Primary Wire, 50 ft Spool
$10.00
18 Gauge Primary Wire, 100 ft Spool
$21.38

Specifications

  • Conductor: Standard bare copper

  • Insulation: PVC (Polyvinyl Chloride)

  • Voltage Rating: Typically up to 60V

  • Standard Temperature Range: -40 to 80 degrees, some variants up to 105 degrees

  • Standards: Meets SAE J-1128, Ford M1L-56A and Chrysler MS-3450 specifications 

GPT wire (General Purpose Thermoplastic wire) is a widely used type of automotive primary wire designed for low-voltage electrical applications in vehicles such as cars, trucks, boats, motorcycles, and trailers. Here's a detailed breakdown of its characteristics and uses:

🔧 Construction

Insulated Wire Made in the USA

  • Conductor: Stranded bare copper, which offers flexibility and good conductivity

  • Insulation: PVC (Polyvinyl Chloride), providing resistance to abrasion, oils, chemicals, and acids

  • Temperature Range: Typically from -40°C to +80°C (or -72°F to 153°F depending on the source)

  • Voltage Rating: Up to 50–60 volts, suitable for low-voltage automotive circuits

  • Maximum amps 18 gauge 7 amps

  • Maximum amps 20 gauge 5 amps

  • Maximum amps 22 gauge 3 amps

    Amps=Watts/Volts

    Since most automotive systems run on 12 volts, here are a few examples:

    • Standard halogen headlight (55 watts):
      5512≈4.6 amps1255​≈4.6 amps

    • LED light (20 watts):
      2012≈1.7 amps1220​≈1.7 amps

    • Brake light bulb (21 watts):
      2112≈1.75 amps1221​≈1.75 amps

🚗Applications

  • General circuit wiring in vehicles

  • Trailer repair

  • Add lights to your motor home

  • Low voltage lighting around the house

  • Motorcycle lights

  • Motorcycle repair

  • Boat lights

  • Automotive lighting

  • Doorbell wire

  • Trailer wiring

  • Interior lighting

  • Car audio installations

  • Heavy duty wire for your home, motorcycle, RV and lighting

  • Custom wire assemblies for automotive projects

✅ Advantages

  • Flexible and easy to route through tight spaces

  • Resistant to common automotive fluids

  • Cost-effective compared to cross-linked polyethylene (XLPE) insulated wire

  • Can be customized with stripes or printed jacketing for identification