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Automotive Wiring Guide

Information on Vehicle Cables for installation of wireless devices, audio, emergency equipment, or other accessories in a motor vehicle.

We are offering advice to help you on your way.

Firstly - For safety and best results, when a circuit is longer than 10 feet, always use the next larger gauge size, which is the next lower even number.

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Typical Low Voltage Wire Sizes Guide

Air Conditioning- 10 GAUGE Heater Switch- 10 GAUGE
Alternator- 10 GAUGE Horn Button- 13 GAUGE
Ammeter- 10 GAUGE Horn To Relay- 10 GAUGE
Cigarette Lighter- 14 GAUGE Ignition Switch- 12 GAUGE
Clock- 18 GAUGE Low-Amps Circuits- 18 GAUGE
Coil Wire- 16 GAUGE Parking Lights- 16 GAUGE
Dome Lights- 16 GAUGE Radio To Fuse Blocks- 14 GAUGE
Driving Lights- 14 GAUGE Single Bulbs- 18 GAUGE
Gauges- 14 GAUGE Starter To Relay- 16 GAUGE
Generator (Charging)- 10 GAUGE Stoplights- 16 GAUGE
Generator To Starter- 16 GAUGE Tail Lights- 16 GAUGE
Headlight Circuit- 14 GAUGE Turn Signals- 16 GAUGE
Headlight Switch To Fuse Block- 12 GAUGE CD To Fuse Block- 14 GAUGE
Heater Leads- 16 GAUGE Windshield Wiper & Washer- 14 GAUGE

 

Wire Gauge Selection Table 12 Volt Circuit

AMPS 3' 5' 7' 10' 15' 20' 25'
0 to 5 18 18 18 18 18 18 18
6 18 18 18 18 18 18 18
7 18 18 18 18 18 18 18
8 18 18 18 18 18 16 16
10 18 18 18 18 16 16 16
11 18 18 18 18 16 16 14
12 18 18 18 18 16 16 14
15 18 18 18 18 14 14 12
18 18 18 16 16 14 14 12
20 18 18 16 16 14 12 10
22 18 18 16 16 12 12 10
24 18 18 16 16 12 12 10
30 18 16 16 14 10 10 10
40 18 16 14 12 10 10 8
50 16 14 12 12 10 10 8
100 12 12 10 10 6 6 4
150 10 10 8 8 4 4

2

200 10 8 8 6 4 4 2

 

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