Primary Wire

Primary wire is the go-to low-voltage wiring for automotive, powersports, marine, RVs, trailers, and equipment control circuits. Built with flexible stranded copper for easy routing, it carries 12V–24V DC and other low-voltage signals reliably, resists abrasion, and withstands oils, chemicals, and vibration in harsh service. Color-coded jackets simplify identification and troubleshooting, speeding up installs and repairs.

You’ll find a range of insulation types tailored to the job. GPT is a dependable, general-purpose automotive wire with PVC insulation. GXL and SXL feature tougher, higher-temperature insulation for under-hood heat and tighter bends, while TXL uses a thin-wall jacket to save weight and space in wire looms. For wet or salty environments, tinned copper “marine-grade” primary wire combats corrosion and maintains conductivity. Equipment and panel builders often choose UL/CSA-rated primary wire (such as UL 1015) for higher voltage and temperature needs. Common temperature ratings span about 80°C to 125°C; voltage ratings vary by spec, so match the wire to the system.

Available in popular AWG sizes from 8 to 22 and in multiple colors, primary wire ships in bulk spools, by-the-foot, or as assorted kits—ideal for custom harnesses, fuse blocks, lighting, pumps, sensors, and accessory power.

How to select:
- Size (AWG): Choose gauge by current draw and run length to limit voltage drop.
- Insulation/spec: GPT for general use; GXL/SXL/TXL for higher heat or tighter routing; UL-rated for panels; tinned copper for marine.
- Environment: Consider heat, fluids, UV exposure, and abrasion.
- Color coding: Use standardized colors to speed diagnostics later.

Pro tips:
- Protect circuits with the right fuse or breaker and confirm ampacity.
- Use quality crimp terminals, heat-shrink, and loom for strain relief and durability.
- Plan grounding and bonding carefully to reduce noise and intermittent faults.

With the right primary wire and accessories—strippers, crimpers, heat gun, and cable ties—you’ll build cleaner, safer, longer-lasting 12V wiring every time.