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A jumper wire is made up of an in-line fuse holder connected to a set of test leads. This tool is
available with small clamp connectors providing adaption to most connectors without damage.
CAUTION: Do not use a fuse with a higher rating than the specified fuse that protects the circuit
being tested. Do not use this tool in any situation to substitute an input or output at the solid-state
control module, such as ECM, TCM, etc.
SHORT FINDER
A short finder is available to locate a short to ground. The short finder creates a pulsing magnetic
field in the shorted circuit and shows you the location of the short through body trim or sheet metal.
TROUBLESHOOTING TEST
1. TESTING FOR VOLTAGE
This test measures voltage in a circuit. When testing for voltage at a connector, you do not have to
separate the two halves of the connector. Instead, probe the connector from the back (backprobe).
Always check both sides of the connector because dirt and corrosion between its contact surfaces
can cause electrical problems.
A. Connect one lead of a test lamp or voltmeter to a ground. If you are using a voltmeter, be sure it
is the voltmeter's negative test lead you have
connected to ground.
B. Connect the other lead of the test lamp or voltmeter to a selected test point (connector or
terminal). C. If the test lamp glows, there is voltage present. If you are using a voltmeter, note the
voltage reading. A loss of more than 1 volt from
specification indicates a problem.
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