You probably want some copper wire with 7mm sq. area(use the formula
below without * 10) for about 50AMP just depends on how many accessories
you run. You probably want it to be at least as thick as the power cable
out of the alternator. If you don't have high amperage cable around you
can use multiple smaller cables in parallel to make up the current
handling, only good for a temporary solution. If the wire gets warm its
too small.
I have also found the following useful to work out approx. nominal
current handling up to 15 AMP for copper wire. I measure the diameter of
a single strand of wire from the cable using a micrometer then use the
following formula
AMPS = (wire_diam * wire_diam / 4 * 3.142) * Number_of_strands * 10
eg. 5 stands of 0.25mm copper wire
AMPs = (0.25 * 0.25 /4 * 3.142) * 5 * 10
AMPS = 2.45
Its a good idea to put a fuse on the wire as close to the battery as
possible especially if your mounting a gauge in the dash.
Craig.
"Paul W. J. Stanley" wrote:
>
> I bought an ammetre guage to check the battery current...it's a series type
> guage, I was wondering how thick I should make the wires, since I'm
> measuring everything except for the starter motor.
>
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