Recommended Wire Sizes
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MINIMUM STARTING CABLE GAUGE SIZE
FOR MOST INBOARD GASOLINE ENGINE APPLICATIONS
UP TO 75” 75” - 125” 125”-175” 175”-225” 225”-275” 275”-325” 325”-425”
4 2 1 0 2/0 3/0 4/0
4 - 6 - 8 Cylinder Gasoline Engine
Total Cranking Circuit
Length in Inches
Minimum Battery Cable Size
0-20 AMPS 14 GA. 12 GA. 12 GA. 10 GA. 10 GA. 8 GA. 8 GA. 8 GA.
20-35 AMPS 12 GA. 10 GA. 8 GA. 8 GA. 6 GA. 6 GA. 6 GA. 4 GA.
35-50 AMPS 10 GA. 8 GA. 8 GA. 6 GA. 6 GA. 4 GA. 4 GA. 4 GA.
50-65 AMPS 8 GA. 8 GA. 6 GA. 4 GA. 4 GA. 4 GA. 4 GA. 4 GA.
65-85 AMPS 6 GA. 6 GA. 4 GA. 4 GA. 2 GA. 2 GA. 2 GA. 0 GA.
85-105 AMPS 6 GA. 6 GA. 4 GA. 2 GA. 2 GA. 2 GA. 2 GA. 0 GA.
105-125 AMPS 4 GA. 4 GA. 4 GA. 2 GA. 2 GA. 0 GA. 0 GA. 0 GA.
125-150 AMPS 2 GA. 2 GA. 2 GA. 2 GA. 0 GA. 0 GA. 0 GA. 00 GA.
0-20 AMPS 14 GA. 14 GA. 14 GA. 12 GA. 12 GA. 12 GA. 10 GA. 10 GA.
20-35 AMPS 12 GA. 12 GA. 12 GA. 10 GA. 10 GA. 8 GA. 8 GA. 8 GA.
35-50 AMPS 10 GA. 10 GA. 10 GA. 10 GA. 6 GA. 6 GA. 6 GA. 6 GA.
50-65 AMPS 8 GA. 8 GA. 8 GA. 8 GA. 6 GA. 4 GA. 4 GA. 4 GA.
65-85 AMPS 6 GA. 6 GA. 6 GA. 6 GA. 6 GA. 6 GA. 4 GA. 4 GA.
85-105 AMPS 6 GA. 6 GA. 6 GA. 6 GA. 4 GA. 4 GA. 4 GA. 2 GA.
105-125 AMPS 4 GA. 4 GA. 4 GA. 4 GA. 4 GA. 4 GA. 2 GA. 2 GA.
125-150 AMPS 2 GA. 2 GA. 2 GA. 2 GA. 2 GA. 2 GA. 2 GA. 2 GA.
TYPE OF OUTPUT UP TO 4 FT. TO 7 FT. TO 10 FT. TO 13 FT. TO 16 FT. TO 19 FT. TO 22 FT. TO
SYSTEM IN AMPERES 4 FT. 7 FT. 10 FT. 13 FT. 16 FT. 19 FT. 22 FT. 28 FT.
TOTAL LENGTH INCLUDING GROUND CABLE
12
VOLT
24
VOLT
MINIMUM CHARGING CABLE GAUGE SIZE
Below you will find the recommended wire sizes for charging and starting systems. IT IS VERY IMPORTANT TO INCLUDE THE
GROUND CABLE WHEN CALCULATING THE TOTAL LENGTH OF THE SYSTEM.
RECOMMENDED WIRE SIZES
The ground cable must carry the same amount of current as the positive cable.
WHEN IN DOUBT - - - - BIGGER IS BETTER!
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