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103

TECHNICAL DATA

PAGES 103 THRU 106

TOTAL APPROX.

CIRCUIT

AMPERES

WIRE GAUGE (FOR LENGTH IN FEET)

12V

3

5

7

10 15 20 25 30 40 50 75 100

1

18 18

18 18 18 18 18 18 18 18 18 18

1.5

18 18

18 18 18 18 18 18 18 18 18 18

2

18 18

18 18 18 18 18 18 18 18 16 16

3

18 18

18 18 18 18 18 18 18 18 14 14

4

18 18

18 18 18 18 18 18 16 16 12 12

5

18 18

18 18 18 18 18 18 16 14 12 12

6

18 18

18 18 18 18 16 16 16 14 12 10

7

18 18

18 18 18 18 16 16 14 14 10 10

8

18 18

18 18 18 16 16 16 14 12 10 10

10

18 18

18 18 16 16 16 14 12 12 10 10

11

18 18

18 18 16 16 14 14 12 12 10

8

12

18 18

18 18 16 16 14 14 12 12 10

8

15

18 18

18 18 14 14 12 12 12 10

8

8

18

16 16

16 16 14 14 12 12 10 10

8

8

20

16 16

16 16 14 12 10 10 10 10

8

6

22

14 14

14 14 12 12 10 10 10

8

6

6

24

14 14

14 14 12 12 10 10 10

8

6

6

30

12 12

12 12 10 10 10 10 10

6

4

4

40

10

8

8

8

8

8

8

8

6

6

4

2

50

8

8

8

8

8

8

8

8

6

6

2

2

100

4

4

4

4

4

4

4

4

4

2

1 1/0

150

2

2

2

2

2

2

2

2

2

1 2/0 2/0

200

1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 4/0 4/0

Using an automotive wiring guide is

critical to help determine the correct

wire or cable gauge for 12-volt

systems. The selection of the correct

gauge for automotive or other low

voltage applications is extremely

important to maximize safety and

performance. Voltage drop or a loss

of candlepower can occur if an

insufficient gauge is used.

Always consider the total amperage

and length of wire in each circuit

when selecting an adequate gauge.

Allow for the return circuit, including

the grounded return, when estimating

the length.

USING THE CHART

1. Measure the length of wire in the

circuit including the ground return.

A two-wire circuit will be the total

lengths of both the wires. Account

for both vehicles on auto and trailer

applications.

2. Find the total amperes, watts, or

candlepower and choose the nearest

number in Circuit Amperes column.

3. Look across for proper footage to

find nearest wire gauge.

Note:

18-gauge applications outside of the shaded

area could be 20-gauge for electrical

purposes. However, it is recommended to

use 18-gauge for the tensile strength of the

wire. Chart is based on maximum 10%

voltage drop @ 100°F (in free air).

Air Conditioner

13 to 20

Alarm System

18 to 20

Anti-lock Brake Module

2 to 6

Cigarette Lighter/Power Outlet

10 to 12

Dash lights

1.5 to 3

Dome Light

1

Electric Clock and Light

0.3

Electric Wiper

3 to 6

Fog Lights

8 to 9

Gauges

0.7 to 1

Headlight Dimmer

2.2

Headlights - Low Beams

8 to 9

Headlights - High Beams

13 to 15

Heater/Defroster

6 to 10

Horns (2)

18 to 20

Ignition

1.5 to 3.5

License Lights

0.5

Parking Lights (2)

1.3

Power Antenna

6 to 10

Power Door Locks

3 to 5

Power Seats

25 to 50

Power Sunroof

20 to 25

Power Windows

2 to 20

Power to Trailer Hitch if Equipped

20 to 30

Radio/CD Player

2 to 5

Rear Window Defogger

20 to 25

Reverse Lights (2)

3.5 to 4

Starter Motor

75 to 300

Starter Solenoid

12 to 20

Stop Lights (2)

3.5 to 4

Side Marker Lights (2)

1.3

Tail Lights (2)

0.5

Trunk Lights

0.5

EQUIPMENT

AVG. AMPS*

*Based on a typical 12-volt system.

TYPICAL AMPERAGE GUIDE

WIRING GUIDE – PRIMARY WIRE & BATTERY CABLE