Power Probe PPCT - Continuity Tester - Manual (Page 7)

7
Checking Fuses in Vehicle
10A
Checking Fuses
Removed from Vehicle
No
Tone
Low
Tone
Warble
Tone
Low
Tone
Low
Tone
Fuse is Good
Fuse is Good Fuse is Bad
Low Tone: No Tone:
Fuse is Good Fuse is Bad Fuse is Bad
Warble
Tone
Warble
Tone
Low
Tone
The following illustration shows fuses that are installed in the vehicle. The ignition key is in the “ON”
position. Even though the ignition key is “ON”, some fuses are under power and some are not. After
you connect the green lead of the SCT to ground, contact the probe tip to both terminals of a good fuse,
you should get identical responses. When you contact both terminals of the fuse and get a dissimilar
response, the fuse is blown.
To do this:
1. Turn the vehicle’s ignition to the “ON” position.
2. Connect the green lead of the SCT to a good ground.
3. Contact the probe tip to each of the two terminals of the fuses and observe the SCT’s response.
See the illustration below and note the difference between a Good and Bad fuse.
12V 12V
10A
0V 0V
10A
OPEN 0V
10A
12V 0V