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The Rear Window Defroster Grid can be checked quite easily with your
Craftsman Analyzer.
You will use either the VOLTMETER, 0-16 VOLTS, or
the OHMMETER (X I) for performing these tests.
Specific test procedures
are outlined in your vehicle service manual.
Resistances encountered in
these circuits will be very low, typically less than one ohm.
CAUTION:
Do not test across Grid Lines on the glass. _Although this
electrically conductive coating is baked onto the glass, it can be
scratched, causing an open circuit and rendering all or part of the heated
rear window inoperable,
Measure only at the terminals wlth connector
disconnected,
WARNING:
Ford Motor Company uses a separate high voltage alternator for
Its quick defrost windshield and rear window on some car lines.
Operating
voltage in this system approaches 120 Volts A. C. Do not attempt to test
this system while "llve". Make only Ohmeter
Tests as instructed in the
Ford Manual with the engine offl
Test Number 34H--Electrical Wiring Harness
All power distribution within the vehicle takes place _ia one or more
color coded wiring harnesses.
If a wire in the harness breaks or a
connector is loose or corroded, voltage will not arrive at its intended
destination. The end result of this is that one or more electrically oper-
ated devices in the vehicle will not operate as they should.
By using your Craftsman Analyzer, Voltmeter, Ohmmeter, and Points (Low
Voltmeter) functions, and with the guidance of your service manual you can
correct certain harness defects.
CAUTION:
If you are tracing voltage through a given system, be careful
not to short that voltage to ground.
A spark can cause electrical
system damage or in the vicinity of the fuel system vapors could
ignite and cause a fire, and personal injury.
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