Power Probe 3EZ Manual page 18

CHECKING FOR BAD GROUNDS
Probe the suspected ground wire or contact with the probe
tip. Observe the green negative sign "-" LED. Depress the
power switch forward then release. If the green negative sign
"-" LED went out and the red positive sign "+" came on, this is
not a true ground.
If the circuit breaker tripped, this circuit is more than likely a
good ground. Keep in mind that high current components
such as starter motors will also trip the circuit breaker.
FOLLOWING AND LOCATING SHORT
CIRCUITS
In most cases a short circuit will appear by a fuse or a fusible
link blowing or an electrical protection device tripping (i.e.,
a circuit breaker). This is the best place to begin the search.
Remove the blown fuse from the fuse box. Use the Power
Probe tip to activate and energize each of the fuse contacts.
The contact which trips the PP3EZ circuit breaker is the short-
ed circuit. Take note of this wire's identification code or color.
Follow the wire as far as you can along the wiring harness, for
instance if you are following a short in the brake light circuit
you may know that the wire must pass though the wiring
harness at the door sill. Locate the color-coded wire in the
harness and expose it. Probe through the insulation with the
Power Probe tip and depress the power switch forward to ac-
tivate and energize the wire. If the Power Probe circuit break-
er tripped you have verified the shorted wire. Cut the wire and
energize each end with the Power Probe tip. (continued)
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