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Corrosion on the battery terminals and dirt or acid on the case top.
Clean the terminals and the case top using a wire brush and a mixture
of water and baking soda.
3.2.2 Connecting to a Battery
Press and hold the
Lock/Power
button to turn on the BT508.
Connect the red clamp to the positive (+) terminal and the black clamp to
the negative (
–
) terminal of the battery.
The black clamp is installed with an infrared sensor near the clamp mouth
that tests the battery temperature. The battery temperature will appear in
the Battery Test Result screen or in the Battery Test Report.
