Back to front page

Go to yahoogroup 80SCOOL email group

Enter the 80SCOOL picture gallery

A wealth of technical information

You've got the car - Now learn how to use it

80SCOOL group stuff for sale

80SCOOL Trips

What's 80SCOOL all about?

Wire Size Calculator

Selecting the correct size of wire or cable when installing accessories is an exacting science. Too small and the result is a large voltage drop and high heat from the wore or cable. High load accessories such compressors or high powered driving lights are particularly demanding and incorrect cable selection can result in fire damage to the vehicle if too small a cable is used.

The guide below should be used to obtain a voltage drop of no more than 0.5V in a 12 V system or 1.0 V in a 24 V system. Also the cable length must include both positive and negative cables. Also, when connecting high load accessories, a separate earth cable should be run to the power source. Do not rely on the vehicle body for ground as this can result in damage to other elctrical equipment in the vehicle.

Select Material
Select Size
Select Voltage
Enter circuit
length in feet

Enter Load
in amperes
Voltage at load
end of circuit
voltage drop
cma of


Click Here to join the 90 Series Prado Technical email group (90scool_aus)