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VOLTAGE DROP RESULTS
NOTE:
If a total system voltage drop
greater than 500mV is
measured, the BCT-460NAV
will show a failed voltage drop
test.
If the voltage drop is high the
test will return a bad result.
The cable that is bad can be
determined by looking at the
POS and NEG drop results. In
this screen the positive cable
is the problem.
If the combined voltage drop of
the positive and negative circuit
is less than 500mV, the voltage
drop test passes. If the voltage
drop test fails you should start by
troubleshooting and repairing the
side of the circuit with the highest
voltage drop.
The Magnetic switch circuit supplies a path for
current to the coils of the starter solenoid with
minimum voltage drop. The Magnetic circuit is
indicated by the dotted line on the illustration to
the left. The Magnetic circuit test is designed to
test the voltage drop of this circuit. It has three
steps. If it passes the first test the whole circuit
passes and there is no need to continue. If the
first test fails the next two tests are completed
to obtain results of each leg and the magnetic
switch itself. The Magnetic switch is energized
by the ignition switch in each test. For safety,
disconnect the negative cable from the battery.
MAGNETIC CIRCUIT TEST
