Automotive Wire

Automotive wire is the most common wire used to connect 12 volt electrical accessories such as automotive relays, fuse blocks, and switch panels. Our automotive wire is available in sizes ranging from 8 gauge to 20 gauge, and is available in 10 different solid colors: Red, Black, White, Green, Blue, Yellow, Brown, Orange, Purple, and Pink. Our automotive wire is wrapped in a thermoplastic PVC insulation, is smooth for pulling through wire loom and conduit, tough enough to resist grease, oil, and acid, and has a temperature rating of 176°F (80°C). If you need a higher temperature and performance wire, use automotive SXL wire instead. Each copper wire core is composed of smaller gauge strands of pure copper creating high conductivity, flexibility, and durability. Our automotive primary wire is a high quality American Made product and is RoHS compliant. It Meets and exceeds SAE spec J1128 and J378. Ideal for wiring 12 volt or 24 volt electrical systems with a maximum voltage rating of 60 volts.

All Automotive Wire on Sale Today!

10 Gauge Automotive Wire

10 Gauge primary automotive wire. Manufactured from 19 strands of 23 gauge copper covered in a durable PVC insulation. Made in the USA.

12 Gauge Automotive Wire

12 Gauge primaryaAutomotive wire. Available in red, black, blue, green, white, yellow, brown, purple, orange, and pink. Temperature rated to 176°F.

14 Gauge Automotive Wire

14 Gauge automotive wire available in red, black, blue, green, white, yellow, brown, purple, orange, and pink. 19 strands of 27 gauge. Made in the USA.

16 Gauge Automotive Wire

16 Gauge automotive wire for 12 volt and 24 volt DC wiring. 10 colors in stock. Made in the USA. ROHS compliant and meets SAE J1128 requirements.

18 Gauge Automotive Wire

18 Gauge primary automotive wire. Made in the USA from 16 strands of 30 gauge pure copper. Temperature rated to 176°F (80°C). 10 colors available,

20 Gauge Automotive Wire

20 AWG primary automotive wire. PVC insulation temperature rated to 176°F (80°C). RoHS compliant and meets SAE J1128. Made in the USA.

8 Gauge Automotive Wire

8 Gauge primary automotive wire. Available colors are red, white, and black. Made in the USA. Composed of 19 strands of 21 gauge pure copper.

Automotive Wire Amperage Capacity Chart

  Recommended Length and Amperage for Automotive Wire while maintaining a 2% or less voltage drop at 12 volts
Automotive Wire Size 5 Amps 10 Amps 15 Amps 20 Amps 25 Amps 30 Amps
20 Gauge Wire (AWG)  4.5 ft 2.2 ft 1.6 ft   .  
18 Gauge Wire (AWG)  7.3 ft 3.7 ft 2.4 ft 1.8 ft    
16 Gauge Wire (AWG)  11.5 ft  5.8 ft  3.8 ft 2.9 ft  2.3 ft  1.9 ft
14 Gauge Wire (AWG)  18.4 ft  9.2 ft  6.1 ft 4.6 ft  3.7 ft  3.1 ft
12 Gauge Wire (AWG)  29.4 ft  14.7 ft  9.8 ft 7.4 ft  5.9 ft  4.9 ft
10 Gauge Wire (AWG) 46.8 ft  23.4 ft  15.6 ft 11.7 ft  9.4 ft 7.8 ft
8 Gauge Wire (AWG)  74.4 ft  37.2 ft  24.8 ft 18.6 ft  14.9 ft  12.4 ft


In order for your automotive electrical system to perform properly, your wire must be sized properly based on the amount of current (amperage) the wire must carry, and the length that the wire needs to be. For example, you want to add some flood lights to your vehicle. The floodlights draw 15 amps of current. The length the wire needs to be to connect to the floodlights is 9 ft. Based on the chart above, you would want to use 12 gauge automotive wire for your floodlights.

Why is the size of an automotive wire so important? When electricity passes through a wire, The wire resists the electricity and some of it is converted into heat that is absorbed by the wire. This lost energy is realized in the form of a voltage drop at the end of the wire. In its simplest terms, you can think of 12 Volts as during 12 units of work. If you're wire has a 2% voltage drop, then the wire is using up 0.24 volts, or units of work.  That leaves 11.76 volts, or units of work left. So if you put a volt meter on your battery and read 12 volts, when you put your volt meter on the end of the wire, you will read 11.76 volts. If you are running 20 amps through your wire then your wire is absorbing 4.8 watts of power. Now let's say your wire has a 20% voltage drop.  The voltage reading on your volt meter at the end of the wire will only be 9.6 volts, and the wire is absorbing a whopping 48 watts of power!

Is it better to solder or to crimp connectors to automotive wire? Soldering is superior since it creates a maximum amount of surface contact between the wire and the terminal or connector. However, in 95% and more cases, a good crimp will work just as well. The key is to make sure that there is good electrical contact between the copper strands of the wire, and the barrel of the terminal or connector. Basically, if you crimp your wire and terminal together, and you cannot pull them apart, the connection will most likely suffice. It is always a good idea to cover the terminated ends of your automotive wire with some heat shrink tubing.

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