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Isuzu N-Series. Service manual - part 1042
CAB AND CHASSIS ELECTRICAL 8-273
In checking, measure the following three points with the
circuit tester in the range of “resistance x 1 (
Ω).”
Between A and B
No continuity (No reading at the indicator)
→
Normal
Continuity (A bite in the feeder. The core grounded)
→
Lower reception
Between B and C
Continuity (Indicator reading: 0
Ω) → Normal
No continuity (Shielded core disconnected or defective
grounding at the screw
→ Hampered by noise)
Between A and D
Continuity or no continuity
There are some antenna feeders and relay feeders with
a condenser built in their connections.
Measuring resistance between the two points does not
result in correct judgment. Connect temporarily another
normal antenna to the radio and check to see if its re-
ception is audible. Most antenna now available are slide
type. Rust at the screw C and the cab panel where
grounded would lead no continuity, followed by lower re-
ception.
Keep this portion clean to avoid rust.
Removal
Preparation:
Disconnect the battery ground cable.
1. Antenna
1) Disconnect the joint connector.
2) Remove the upper and lower side antenna
bracket.
3) Pull out the antenna feeder.
Notice:
For easier fitting, tie the lead wire to the end of the an-
tenna feeder in advance.
Installation
To install, follow the removal steps in the reverse order.
Speaker
Inspection
1. With the circuit tester set to the range of
× 1 (Ω),
connect the circuit tester probes (red and black) to
the (+) and (
−) terminals of the speaker.
2. When the speaker is normal, a low buzzing sound
is heard.
3. When the speaker is defective, no sound is heard.
However, the distortion or chattering of the sound
cannot be identified.
When the speaker is installed to the vehicle, dis-
connect the connectors before checking.
N8A0289E
Legend
1. Antenna
2. Antenna Bracket
3. Feeder
4. Joint Connection
5. Feeder
6. Clip
7. Radio
1
2
3
4
5
6
7
N8A0394E