41
VOLTAGE DROP RESULTS
NOTE: If a total system voltage drop
greater than 500mV is
measured, the BCT Tester
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 rst test the whole
circuit passes and there is no need to continue.
If the rst 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, temporarily disconnect the negative
battery cable while performing tester hook up
at the starter, and while disconnecting the “S”
terminal wire. Reconnect the negative cable to
perform the test, then disconnect the negative
battery cable again when nished, to restore
connections back to original. This is to prevent
accidental arcing, short circuits, and accidental
engine cranking while working at the starter.
When nished, you can reconnect the negative
battery cable.
MAGNETIC CIRCUIT TEST
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