Autel PowerScan PS100 - Manual (Page 18)

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Observe the green LED. Depress the power switch forward then
release. If the green LED went out and the red LED 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.
3.9 Following & 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 probe tip to activate and energize each of the fuse
contacts. The contact which trips the circuit breaker is the
shorted circuit. Take note of this wire‟s identification code or
color.
 Follow the wire as far as you can along the wiring harness.
Here is an example for this application.
 If you are following a short in the brake light circuit, you may
know that the wire must pass through the wiring harness at the
door sill. Locate the color-coded wire in the harness and expose
it.
 Probe through the insulation with the probe tip, and depress the
power switch forward to activate and energize the wire.
 If the circuit breaker tripped, you have verified the shorted wire.
Cut the wire and energize each end with the probe tip. The wire
end which trips the circuit breaker again is the shorted circuit
and it will lead you to the shorted area.