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Battery cables connect the battery to the rest of the starting and
charging circuits. A starting motor which is cranking an engine will
draw about 200 amps of current, so the battery cables must be of
sufficient size to carry such heavy current.
Since the cables are close to the battery and could corrode, it is
important that the cables make good electrical contact with the cable
clamps. In the same way, clamps must make good electrical contact
with the battery posts. Any looseness or corrosion between the cable
and its clamp, or between the cable clamp and battery, will result in
high resistance and consequent voltage drop.
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