15
Automotive Circuit Probe & Breaker Finder Kit
◆ Circuit Probe：
DC voltage range: 0-65V + 1 digit
Resistance range: 0-100 kΩ
Frequency response of tone pass through 0Hz to 10Khz
Circuit Breaker
Rating current: 1-10 Amp
◆ Breaker Finder：
DC voltage range: 6-24V
Special features: sho cable nder
3.9 Following & Locating Sho Circuits
In most cases a sho circuit wil 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 shoed circuit. Take note of this wire's identication code or
color. Follow the wire as far as you can along the wiring harness.
Here is an example of this application.
If you are following a sho 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 veried the shoed wire. Cut the wire and energize
each end with the probe tip. The wire end which trips the circuit breaker again is the shoed
circuit and it will lead you to the shoed area.
Follow the wire in the shoed direction and repeat this process until the sho is located.
3.10 Checking for Bad Ground Contacts
4. Test Tool Specications
Probe the suspected ground wire or contact with the probe tip.
Obsee the green LED. Depress the power switch forward then release. If the green LED
went out and the red LED came on, a beep will sound, 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 staer motors will also trip the circuit breaker.
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