DHC BT900 Manual Del Usuario página 4

Note that nothing will be seen on the display until the tester is connected
to a vehicle battery.
3. Make sure the battery terminals are clean. Wire brush them if necessary.
Clamp the black load lead to the vehicle negative battery terminal. Clamp the
red load lead to the vehicle positive battery terminal. Please clamp on the lead
part of the terminal only. Clamping on the iron part of the terminal will lead to
wrong test results.
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